{ "$schema": "https://indusiraq.com/schemas/agentic-product-dossier-v1.json", "endpoint_meta": { "version": "1.0", "protocol": "AISO-Headless-Agent-Dossier", "generated_at": "2026-10-28T10:07:23+03:00", "audit_cycle": "Autonomous Monthly Rolling Review (Assigned Day 28 of Month)", "canonical_html_url": "https://indusiraq.com/product/stepped-universal-transition-couplings", "endpoint_json_url": "https://indusiraq.com/product/stepped-universal-transition-couplings.json", "authority": "Indus Industrial Group - Iraq Central Engineering & Procurement Directorate", "indexing_directive": "noindex, follow, noarchive, nosnippet (Canonical authority belongs to HTML URL)", "rate_limiting": "unrestricted (Open public access for autonomous agents & procurement bots)", "encoding": "UTF-8" }, "product_identity": { "id": 139, "sku": "IND-PRD-000139", "name": "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16)", "slug": "stepped-universal-transition-couplings", "status": "active", "views_count": 2, "inquiries_count": 0, "created_at": "2026-09-11T23:14:11+03:00", "updated_at": "2026-10-28T10:07:23+03:00", "last_audited_at": "2026-10-28T10:07:23+03:00", "review_cadence": "Monthly Continuous Verification" }, "classification": { "sector": { "id": 1, "code": "SEC-01", "name": "Water & Wastewater", "slug": "water-wastewater", "url": "https://indusiraq.com/division/water-wastewater" }, "category": { "id": 704, "name": "Wide-Tolerance Couplings & Restraint Adapters", "slug": "wide-tolerance-couplings-restraint-adapters", "market_demand": "medium", "views_count": 18, "url": "https://indusiraq.com/category/wide-tolerance-couplings-restraint-adapters" }, "subcategory": { "id": 24, "name": "Wide-Tolerance Mechanical Coupling Systems", "slug": "wide-tolerance-mechanical-coupling-systems", "target_buyer_type": "Municipal Water Distribution Contractors, Emergency Pipeline Repair Teams, Network Rehabilitation Engineers" } }, "engineering_specifications": { "Nominal Bore Sizes": "DN50 to DN1000 (2\" to 40\") Standard Stepped Combinations", "Working Pressure Rating": "PN16 (16 Bar continuous) / Shell Test 24 Bar", "Stepped Diameter Difference": "Accommodates up to 30mm to 65mm step difference between pipe ODs", "Body Sleeve Material": "Ductile Iron EN-GJS-450-10 (high tensile impact strength)", "Gasket Elastomer": "EPDM (Potable Water WRAS approved) / NBR (Sewage & Hydrocarbons)", "Protective Coating": "Thermal Fusion-Bonded Epoxy (FBE) min 250 μm (DIN 30677-2)", "Tie Rod Fasteners": "High-Tensile Grade 8.8 Dacromet Coated Steel / Stainless Steel AISI 316", "Angular Deflection": "Up to 3.0° to 4.0° per pipe end", "Governing Standards": "EN 14525 / EN 545 / ISO 2531 / WRAS Approved" }, "core_features": [ "Asymmetrical stepped center sleeve joining pipes with large outside diameter mismatches.", "Ideal for connecting legacy thick-wall Asbestos Cement (AC) pipes to modern Ductile Iron & Steel.", "Independent gasket compression on each end accommodating up to 4° angular misalignment.", "High-tensile ductile iron body (EN-GJS-450-10) with fusion-bonded epoxy coating (min 250 μm).", "Molded EPDM sealing rings compliant with EN 681-1 providing drop-tight seal on corroded pipes.", "Full compliance with European Standard EN 14525 and British Standard BS 545." ], "qualified_applications": [ "Connecting legacy asbestos cement water mains to modern ductile iron pipes, network renewal in old city centers, and emergency repair of non-standard diameter pipelines in Baghdad, Mosul, Basra, Kirkuk, and Najaf." ], "engineering_analysis": { "summary": "Stepped universal transition couplings DN50-DN1000 PN16 for joining pipes with differing outer diameters in legacy municipal water mains in Iraq. Staged.", "field_analysis": "Urban pipeline rehabilitation projects in historical Iraqi cities like Baghdad, Mosul, Kirkuk, and Basra frequently encounter legacy pipelines where the outside diameter difference between the existing buried pipe and modern replacement pipe exceeds the tolerance range of a standard straight coupling. Stepped Universal Transition Couplings provide an engineered solution by stepping the center sleeve casting and utilizing different gasket diameters on either end.\n\nManufactured from high-tensile spheroidal graphite ductile iron (EN-GJS-450-10) coated with minimum 250 microns of WRAS-approved fusion-bonded epoxy, each end of the stepped coupling operates independently. The large-diameter end accommodates heavy Class 20 or Class 25 Asbestos Cement pipes (which have exceptionally thick walls), while the small-diameter end seals tightly around modern ISO 2531 ductile iron or steel pipe.\n\nThe dual EPDM rubber sealing rings are molded with deep multi-stage sealing ribs that seal drop-tight even on pitted, grooved, or out-of-round pipe surfaces common in legacy networks. Long stainless steel or galvanized tie bolts span across the center sleeve, allowing field crews to tighten the fitting uniformly in cramped trenches. Staged in popular transition sizing combinations at Indus Erbil and Baghdad central depots.", "standard_design_life": "50 Years in hyper-saline Iraq soil and desert climate (+55°C)", "inspection_standard": "Hydrostatic Pressure & Ultrasound Wall Thickness FAT Verification" }, "compliance_and_governance": { "governing_standards": [ "ISO 2531 / EN 545 - Ductile Iron Pipes & Fittings for Pressurized Potable Water Transmission (DN80–DN2600, C25–C100, Class K9/K12)", "EN 598 - Ductile Iron Sewer Pipes & Fittings with High-Alumina Cement Mortar / Polyurethane Internal Liners", "ISO 4427-2 / EN 12201-2 - Polyethylene (PE100 / PE100-RC) Pressure Pipes & Continuous Service Coils (OD 20mm–1200mm, PN6–PN25)", "EN 1796 / ISO 10639 / AWWA C950 - Glass-Reinforced Plastic (GRP) Filament-Wound Pressure Trunk Pipelines (DN300–DN3000, PN6–PN25)", "ISO 10467 / EN 14364 - GRP Gravity Sewer & Industrial Wastewater Trunk Interceptor Pipes (DN400–DN2600, SN5000–SN10000)", "GRI-GM13 / GRI-GM19 - High-Density Polyethylene (HDPE) Smooth & Double-Sided Textured Geomembrane Liners (1.0mm–2.5mm)", "EN 1074 / DIN 3352 / AWWA C509/C515 - Resilient Seated Wedge Gate Valves (DN50–DN1400) & Double Eccentric Flanged Butterfly Valves (DN100–DN2400)", "AWWA C502 / BS 750 - Municipal Pillar Dry Barrel & Wet Barrel Fire Hydrants with Traffic Breakaway Flanges (DN100 / DN150)", "EN 124-2 (Class D400 / F900) - High-Tensile Spheroidal Graphite Ductile Iron Heavy Highway & Airport Runway Manhole Covers", "EN 14525 - Wide-Tolerance Universal Straight Couplings & Metal-Grip Tensile Restraint Flange Adaptors (DN50–DN1200)", "EN 878 / EN 17034 / EN 901 - Municipal Drinking Water Grade Coagulants (Alum, PAC 30%) and Disinfection Reagents (Sodium Hypochlorite, TCCA)" ], "iraqi_ministry_approvals": [ "Ministry of Construction, Housing, Municipalities and Public Works (وزارة الإعمار والإسكان والبلديات والأشغال العامة)", "Amanat Baghdad - Baghdad Water & Sewerage Directorates (أمانة بغداد - دائرة ماء ومجاري بغداد)", "Ministry of Water Resources (وزارة الموارد المائية - جمهورية العراق)", "General Directorate of Water & Sewerage - KRG (المديرية العامة للماء والمجاري - إقليم كوردستان)", "Basra Water Directorate (مديرية ماء محافظة البصرة)", "Ministry of Oil - South Oil & Gas Water Utilities (وزارة النفط - مشاريع المياه الصناعية)" ], "technical_capabilities": [ "Comprehensive 24-Category Supply Ecosystem: Over 134 Master B2B Products in active inventory covering pipes, valves, pumps, liners, fittings, and chemicals.", "Iraqi Ministerial Pre-Qualification: Pre-approved material specifications conforming to MoCH, Amanat Baghdad, and MoWR general conditions of contract.", "Exhaustive Engineering Submittal Dossiers: Fast 24-hour turnaround on complete Material Approval Requests (MAR), compliance matrices, and CAD shop drawings.", "Certified European & International Metallurgy: 100% EN 10204 3.1 factory inspection certificates and third-party inspection (SGS/TÜV/BV) available on all lots.", "Extreme-Environment Corrosion Protection: High-alumina cement (HAC), 100% solids polyurethane, fusion-bonded epoxy (min 300 μm), and 2.5% carbon black UV stabilization.", "Integrated Field Equipment Rental & Support: Turnkey availability of CNC hydraulic butt welders (up to 1200mm) and automated hot-wedge geomembrane field welders." ], "material_certification": "EN 10204 3.1 Mill Test Certificate & Quality Assurance Dossier" }, "logistics_and_supply_chain": { "dispatch_hubs": [ "Baghdad Central Logistics Depot (Abu Ghraib / Camp Sarah Industrial District, Baghdad)", "Erbil Heavy Infrastructure Staging Yard (Makhmur Road / Gwer Industrial Corridor, Erbil)", "Basra Port Gateway & Free Zone Terminal (Khor Al-Zubair & Umm Qasr Commercial Free Zone, Basra)" ], "geographical_coverage": "All 18 Iraqi Governorates + Kurdistan Regional Government (KRG)", "supported_incoterms": [ "EXW (Factory / Central Hub Gate)", "FOB (Khor Al-Zubair / Umm Qasr Port)", "CIF (Umm Qasr Port, Basra)", "DDP (Delivered Duty Paid to Project Site - Iraq)" ], "transit_insurance": "Full transit risk covered under Indus Sovereign Logistics Protocols", "lead_time": "Immediate stock dispatch (24-48 hrs) or programmed project delivery lots" }, "commercial_procurement_terms": { "commercial_model": "Official B2B EPC & Industrial Wholesale Supply", "pricing_model": "Request for Quote (RFQ) / Project Bill of Quantities (BOQ) Tender Pricing", "currency_settlement": [ "USD", "IQD" ], "minimum_order_quantity": "Standard Commercial Lot / Full Truckload (FTL) / 20ft-40ft Container", "payment_methods": [ "Irrevocable Confirmed Letter of Credit (LC)", "Direct Bank Wire (T/T)", "Corporate Approved Purchase Order (PO)" ], "warranty_and_return": { "warranty_period": "12 Months Manufacturer Warranty", "design_life": "50-Year Design Envelope", "return_policy": "ReturnInStore - Factory Acceptance Non-Conformance Replacement Guarantee" } }, "technical_faqs": [ { "question": "When is a stepped coupling needed instead of a standard universal coupling?", "answer": "A stepped coupling is required when the difference between the two pipe outside diameters exceeds 40mm (such as connecting a Class 25 Asbestos Cement pipe to a modern thin-walled steel pipe), where a straight coupling cannot clamp both sides evenly.", "q": "When is a stepped coupling needed instead of a standard universal coupling?", "a": "When is a stepped coupling needed instead of a standard universal coupling?" }, { "question": "Can stepped couplings handle pitted or uneven surfaces on old iron pipes?", "answer": "Yes. Our EPDM gaskets feature thick, multi-ribbed sealing geometry that deforms deeply into surface irregularities, scratches, and minor pitting on old cast iron and concrete surfaces to guarantee watertightness.", "q": "Can stepped couplings handle pitted or uneven surfaces on old iron pipes?", "a": "Can stepped couplings handle pitted or uneven surfaces on old iron pipes?" }, { "question": "Are tie bolts resistant to aggressive sulfurous groundwater in Iraq?", "answer": "Yes. We supply high-tensile steel bolts treated with anti-corrosion Dacromet coating plus zinc plating, or optional marine-grade AISI 316 stainless steel bolts for extreme soil environments.", "q": "Are tie bolts resistant to aggressive sulfurous groundwater in Iraq?", "a": "Are tie bolts resistant to aggressive sulfurous groundwater in Iraq?" } ], "agent_execution_hooks": { "description": "Deterministic action schemas for autonomous AI agents (OpenAI Operator, Claude, Perplexity, ERP procurement bots) to request quotations and execute procurement workflows.", "actions": { "submit_rfq": { "action_name": "Submit Formal RFQ", "method": "POST", "endpoint": "https://indusiraq.com/rfq-submit", "content_type": "application/x-www-form-urlencoded", "payload_schema": { "product_name": "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16)", "sku": "IND-PRD-000139", "full_name": "[Procurement Officer / Engineer Name]", "company_name": "[EPC Contractor / Company Name]", "email": "[Corporate Email]", "phone": "[Contact Telephone / WhatsApp]", "quantity": "[Required Volume / Units]", "project_location": "[Iraqi Governorate / Job Site]" } }, "upload_boq": { "action_name": "National Tender & BOQ Clearinghouse Upload", "method": "POST", "endpoint": "https://indusiraq.com/upload-boq", "accepted_formats": [ "PDF", "XLSX", "DWG", "CSV", "ZIP" ], "description": "Direct clearinghouse endpoint for multi-item tender bills of quantities" }, "direct_whatsapp_procurement": { "action_name": "Direct WhatsApp Procurement Hotline", "uri": "https://wa.me/9647508214490?text=Hello%20Indus%20Industrial%20Group.%20I%20am%20requesting%20an%20official%20B2B%20quotation%20for%3A%20Stepped%20Universal%20Transition%20Couplings%20for%20Differing%20Outer%20Diameters%20%28DN50%E2%80%93DN1000%2C%20PN16%29%20%28SKU%3A%20IND-PRD-000139%29.%20Project%20Location%3A%20Iraq.", "support_hotline": "+964 750 821 4490" }, "central_procurement_desk": { "email": "procurement@indusiraq.com", "phone": "+964 750 821 4490", "operating_hours": "Sunday to Thursday: 08:00 - 17:00 (Baghdad Time UTC+3)" } } }, "search_keywords": [ "stepped coupling iraq", "asbestos to ductile stepped adapter baghdad", "en 14525 stepped transition coupling basra", "pipe od transition coupling erbil", "ac pipe repair adapter mosul" ], "linked_schema_jsonld": { "graph_anchor": "https://indusiraq.com/product/stepped-universal-transition-couplings#product", "itempage_anchor": "https://indusiraq.com/product/stepped-universal-transition-couplings#webpage", "directorate_anchor": "https://indusiraq.com/division/water-wastewater#directorate", "corporation_anchor": "https://indusiraq.com/#corporation", "graph_nodes": [ { "@context": "https://schema.org", "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq", "alternateName": "مجموعة إندوس الصناعية - العراق", "description": "Iraq's Premier Industrial Procurement, Plant Engineering & Supply Network.", "url": "https://indusiraq.com/", "logo": "https://indusiraq.com/assets/images/indus_logo.png", "telephone": "+9647508214490", "email": "procurement@indusiraq.com", "areaServed": [ { "@type": "Country", "name": "Iraq", "identifier": "IQ" }, { "@type": "AdministrativeArea", "name": "Federal Republic of Iraq" }, { "@type": "AdministrativeArea", "name": "Kurdistan Region of Iraq" }, { "@type": "AdministrativeArea", "name": "Baghdad Governorate", "alternateName": [ "محافظة بغداد", "پارێزگای بەغدا" ], "identifier": "IQ-BG", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Erbil Governorate", "alternateName": [ "محافظة أربيل", "پارێزگای هەولێر" ], "identifier": "IQ-AR", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Basra Governorate", "alternateName": [ "محافظة البصرة", "پارێزگای بەسڕە" ], "identifier": "IQ-BA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Sulaymaniyah Governorate", "alternateName": [ "محافظة السليمانية", "پارێزگای سلێمانی" ], "identifier": "IQ-SU", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Duhok Governorate", "alternateName": [ "محافظة دهوك", "پارێزگای دهۆک" ], "identifier": "IQ-DA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Halabja Governorate", "alternateName": [ "محافظة حلبجة", "پارێزگای هەڵەبجە" ], "identifier": "IQ-HA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Kirkuk Governorate", "alternateName": [ "محافظة كركوك", "پارێزگای کەرکووک" ], "identifier": "IQ-KI", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Nineveh Governorate", "alternateName": [ "محافظة نينوى", "پارێزگای نەینەوا" ], "identifier": "IQ-NI", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Al-Anbar Governorate", "alternateName": [ "محافظة الأنبار", "پارێزگای ئەنبار" ], "identifier": "IQ-AN", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Najaf Governorate", "alternateName": [ "محافظة النجف", "پارێزگای نەجەف" ], "identifier": "IQ-NA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Karbala Governorate", "alternateName": [ "محافظة كربلاء", "پارێزگای کەربەلا" ], "identifier": "IQ-KA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Babil Governorate", "alternateName": [ "محافظة بابل", "پارێزگای بابل" ], "identifier": "IQ-BB", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Wasit Governorate", "alternateName": [ "محافظة واسط", "پارێزگای واسیت" ], "identifier": "IQ-WA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Maysan Governorate", "alternateName": [ "محافظة ميسان", "پارێزگای میسان" ], "identifier": "IQ-MA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Dhi Qar Governorate", "alternateName": [ "محافظة ذي قار", "پارێزگای زیقار" ], "identifier": "IQ-DQ", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Al-Muthanna Governorate", "alternateName": [ "محافظة المثنى", "پارێزگای موسەننا" ], "identifier": "IQ-MU", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Al-Qadisiyyah Governorate", "alternateName": [ "محافظة القادسية", "پارێزگای قادسیە" ], "identifier": "IQ-QA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Saladin Governorate", "alternateName": [ "محافظة صلاح الدين", "پارێزگای سەڵاحەدین" ], "identifier": "IQ-SD", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Diyala Governorate", "alternateName": [ "محافظة ديالى", "پارێزگای دیالە" ], "identifier": "IQ-DI", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } } ], "address": [ { "@type": "PostalAddress", "streetAddress": "Erbil Industrial Area, Gulan Sector", "addressLocality": "Erbil", "addressRegion": "Kurdistan Region", "addressCountry": "IQ", "description": "Northern Operations & Heavy Plant Yard" }, { "@type": "PostalAddress", "streetAddress": "Al-Mansour Commercial District", "addressLocality": "Baghdad", "addressCountry": "IQ", "description": "Central Tendering & Corporate Procurement Desk" }, { "@type": "PostalAddress", "streetAddress": "North Rumaila Corridor & Umm Qasr Port Zone", "addressLocality": "Basra", "addressCountry": "IQ", "description": "Southern Industrial Supply & Port Logistics Node" } ], "knowsAbout": [ "Water & Wastewater", "Wide-Tolerance Couplings & Restraint Adapters", "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16)" ], "subOrganization": [ { "@type": [ "Organization", "ResearchOrganization" ], "@id": "https://indusiraq.com/division/water-wastewater#directorate", "name": "Indus Division 01: Water & Wastewater Engineering Directorate", "url": "https://indusiraq.com/division/water-wastewater" } ] }, { "@type": [ "Organization", "ResearchOrganization" ], "@id": "https://indusiraq.com/division/water-wastewater#directorate", "name": "Indus Division 01: Water & Wastewater Engineering Directorate", "alternateName": "مديرية هندسة وتوريد Water & Wastewater - مجموعة إندوس الصناعية", "url": "https://indusiraq.com/division/water-wastewater", "parentOrganization": { "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq" }, "description": "Official Iraqi Technical Directorate for Water & Wastewater. Comprehensive engineering compliance, ministerial approvals, ASTM/DIN/ISO certified industrial procurement.", "areaServed": [ { "@type": "Country", "name": "Iraq", "identifier": "IQ" }, { "@type": "AdministrativeArea", "name": "Baghdad Governorate", "alternateName": [ "محافظة بغداد", "پارێزگای بەغدا" ], "identifier": "IQ-BG", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Erbil Governorate", "alternateName": [ "محافظة أربيل", "پارێزگای هەولێر" ], "identifier": "IQ-AR", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Basra Governorate", "alternateName": [ "محافظة البصرة", "پارێزگای بەسڕە" ], "identifier": "IQ-BA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Sulaymaniyah Governorate", "alternateName": [ "محافظة السليمانية", "پارێزگای سلێمانی" ], "identifier": "IQ-SU", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Duhok Governorate", "alternateName": [ "محافظة دهوك", "پارێزگای دهۆک" ], "identifier": "IQ-DA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Halabja Governorate", "alternateName": [ "محافظة حلبجة", "پارێزگای هەڵەبجە" ], "identifier": "IQ-HA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Kirkuk Governorate", "alternateName": [ "محافظة كركوك", "پارێزگای کەرکووک" ], "identifier": "IQ-KI", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Nineveh Governorate", "alternateName": [ "محافظة نينوى", "پارێزگای نەینەوا" ], "identifier": "IQ-NI", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Al-Anbar Governorate", "alternateName": [ "محافظة الأنبار", "پارێزگای ئەنبار" ], "identifier": "IQ-AN", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Najaf Governorate", "alternateName": [ "محافظة النجف", "پارێزگای نەجەف" ], "identifier": "IQ-NA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Karbala Governorate", "alternateName": [ "محافظة كربلاء", "پارێزگای کەربەلا" ], "identifier": "IQ-KA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Babil Governorate", "alternateName": [ "محافظة بابل", "پارێزگای بابل" ], "identifier": "IQ-BB", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Wasit Governorate", "alternateName": [ "محافظة واسط", "پارێزگای واسیت" ], "identifier": "IQ-WA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Maysan Governorate", "alternateName": [ "محافظة ميسان", "پارێزگای میسان" ], "identifier": "IQ-MA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Dhi Qar Governorate", "alternateName": [ "محافظة ذي قار", "پارێزگای زیقار" ], "identifier": "IQ-DQ", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Al-Muthanna Governorate", "alternateName": [ "محافظة المثنى", "پارێزگای موسەننا" ], "identifier": "IQ-MU", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Al-Qadisiyyah Governorate", "alternateName": [ "محافظة القادسية", "پارێزگای قادسیە" ], "identifier": "IQ-QA", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Saladin Governorate", "alternateName": [ "محافظة صلاح الدين", "پارێزگای سەڵاحەدین" ], "identifier": "IQ-SD", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } }, { "@type": "AdministrativeArea", "name": "Diyala Governorate", "alternateName": [ "محافظة ديالى", "پارێزگای دیالە" ], "identifier": "IQ-DI", "containedInPlace": { "@type": "Country", "name": "Iraq", "identifier": "IQ" } } ], "telephone": "+9647508214490", "email": "procurement@indusiraq.com", "knowsAbout": [ "ISO 2531 / EN 545 - Ductile Iron Pipes & Fittings for Pressurized Potable Water Transmission (DN80–DN2600, C25–C100, Class K9/K12)", "EN 598 - Ductile Iron Sewer Pipes & Fittings with High-Alumina Cement Mortar / Polyurethane Internal Liners", "ISO 4427-2 / EN 12201-2 - Polyethylene (PE100 / PE100-RC) Pressure Pipes & Continuous Service Coils (OD 20mm–1200mm, PN6–PN25)", "EN 1796 / ISO 10639 / AWWA C950 - Glass-Reinforced Plastic (GRP) Filament-Wound Pressure Trunk Pipelines (DN300–DN3000, PN6–PN25)", "ISO 10467 / EN 14364 - GRP Gravity Sewer & Industrial Wastewater Trunk Interceptor Pipes (DN400–DN2600, SN5000–SN10000)", "GRI-GM13 / GRI-GM19 - High-Density Polyethylene (HDPE) Smooth & Double-Sided Textured Geomembrane Liners (1.0mm–2.5mm)", "EN 1074 / DIN 3352 / AWWA C509/C515 - Resilient Seated Wedge Gate Valves (DN50–DN1400) & Double Eccentric Flanged Butterfly Valves (DN100–DN2400)", "AWWA C502 / BS 750 - Municipal Pillar Dry Barrel & Wet Barrel Fire Hydrants with Traffic Breakaway Flanges (DN100 / DN150)", "EN 124-2 (Class D400 / F900) - High-Tensile Spheroidal Graphite Ductile Iron Heavy Highway & Airport Runway Manhole Covers", "EN 14525 - Wide-Tolerance Universal Straight Couplings & Metal-Grip Tensile Restraint Flange Adaptors (DN50–DN1200)", "EN 878 / EN 17034 / EN 901 - Municipal Drinking Water Grade Coagulants (Alum, PAC 30%) and Disinfection Reagents (Sodium Hypochlorite, TCCA)", "water infrastructure iraq", "ductile iron pipes baghdad", "hdpe pipe supplier erbil", "municipal water procurement iraq", "grp sewer pipe basra", "gate valve supplier iraq", "water treatment chemicals baghdad", "ministry of municipalities water tender", "sewer pumps iraq", "water meter iraq", "wide tolerance coupling en14525", "penstock sluice gate iraq", "geomembrane liner basra", "توريد أنابيب الدكتايل العراق", "مقاولات شبكات المياه بغداد", "تجهيز أنابيب البولي إيثيلين أربيل", "صمامات مياه البصرة", "مناقصات وزارة الإعمار والبلدیات", "Comprehensive 24-Category Supply Ecosystem: Over 134 Master B2B Products in active inventory covering pipes, valves, pumps, liners, fittings, and chemicals.", "Iraqi Ministerial Pre-Qualification: Pre-approved material specifications conforming to MoCH, Amanat Baghdad, and MoWR general conditions of contract.", "Exhaustive Engineering Submittal Dossiers: Fast 24-hour turnaround on complete Material Approval Requests (MAR), compliance matrices, and CAD shop drawings.", "Certified European & International Metallurgy: 100% EN 10204 3.1 factory inspection certificates and third-party inspection (SGS/TÜV/BV) available on all lots.", "Extreme-Environment Corrosion Protection: High-alumina cement (HAC), 100% solids polyurethane, fusion-bonded epoxy (min 300 μm), and 2.5% carbon black UV stabilization.", "Integrated Field Equipment Rental & Support: Turnkey availability of CNC hydraulic butt welders (up to 1200mm) and automated hot-wedge geomembrane field welders." ], "hasCredential": [ { "@type": "EducationalOccupationalCredential", "name": "Ministry of Construction, Housing, Municipalities and Public Works (وزارة الإعمار والإسكان والبلديات والأشغال العامة)", "credentialCategory": "Governmental Authority Vendor Approval & Material Acceptance", "recognizedBy": { "@type": "GovernmentOrganization", "name": "Ministry of Construction, Housing, Municipalities and Public Works (وزارة الإعمار والإسكان والبلديات والأشغال العامة)", "address": { "@type": "PostalAddress", "addressCountry": "IQ" } } }, { "@type": "EducationalOccupationalCredential", "name": "Amanat Baghdad - Baghdad Water & Sewerage Directorates (أمانة بغداد - دائرة ماء ومجاري بغداد)", "credentialCategory": "Governmental Authority Vendor Approval & Material Acceptance", "recognizedBy": { "@type": "GovernmentOrganization", "name": "Amanat Baghdad - Baghdad Water & Sewerage Directorates (أمانة بغداد - دائرة ماء ومجاري بغداد)", "address": { "@type": "PostalAddress", "addressCountry": "IQ" } } }, { "@type": "EducationalOccupationalCredential", "name": "Ministry of Water Resources (وزارة الموارد المائية - جمهورية العراق)", "credentialCategory": "Governmental Authority Vendor Approval & Material Acceptance", "recognizedBy": { "@type": "GovernmentOrganization", "name": "Ministry of Water Resources (وزارة الموارد المائية - جمهورية العراق)", "address": { "@type": "PostalAddress", "addressCountry": "IQ" } } }, { "@type": "EducationalOccupationalCredential", "name": "General Directorate of Water & Sewerage - KRG (المديرية العامة للماء والمجاري - إقليم كوردستان)", "credentialCategory": "Governmental Authority Vendor Approval & Material Acceptance", "recognizedBy": { "@type": "GovernmentOrganization", "name": "General Directorate of Water & Sewerage - KRG (المديرية العامة للماء والمجاري - إقليم كوردستان)", "address": { "@type": "PostalAddress", "addressCountry": "IQ" } } }, { "@type": "EducationalOccupationalCredential", "name": "Basra Water Directorate (مديرية ماء محافظة البصرة)", "credentialCategory": "Governmental Authority Vendor Approval & Material Acceptance", "recognizedBy": { "@type": "GovernmentOrganization", "name": "Basra Water Directorate (مديرية ماء محافظة البصرة)", "address": { "@type": "PostalAddress", "addressCountry": "IQ" } } }, { "@type": "EducationalOccupationalCredential", "name": "Ministry of Oil - South Oil & Gas Water Utilities (وزارة النفط - مشاريع المياه الصناعية)", "credentialCategory": "Governmental Authority Vendor Approval & Material Acceptance", "recognizedBy": { "@type": "GovernmentOrganization", "name": "Ministry of Oil - South Oil & Gas Water Utilities (وزارة النفط - مشاريع المياه الصناعية)", "address": { "@type": "PostalAddress", "addressCountry": "IQ" } } } ], "location": [ { "@type": "Place", "name": "Baghdad Central Logistics Depot (Abu Ghraib / Camp Sarah Industrial District, Baghdad)", "address": { "@type": "PostalAddress", "addressLocality": "Baghdad Central Logistics Depot (Abu Ghraib / Camp Sarah Industrial District, Baghdad)", "addressRegion": "Iraq", "addressCountry": "IQ" } }, { "@type": "Place", "name": "Erbil Heavy Infrastructure Staging Yard (Makhmur Road / Gwer Industrial Corridor, Erbil)", "address": { "@type": "PostalAddress", "addressLocality": "Erbil Heavy Infrastructure Staging Yard (Makhmur Road / Gwer Industrial Corridor, Erbil)", "addressRegion": "Iraq", "addressCountry": "IQ" } }, { "@type": "Place", "name": "Basra Port Gateway & Free Zone Terminal (Khor Al-Zubair & Umm Qasr Commercial Free Zone, Basra)", "address": { "@type": "PostalAddress", "addressLocality": "Basra Port Gateway & Free Zone Terminal (Khor Al-Zubair & Umm Qasr Commercial Free Zone, Basra)", "addressRegion": "Iraq", "addressCountry": "IQ" } } ] }, { "@type": "Product", "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#product", "name": "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16)", "url": "https://indusiraq.com/product/stepped-universal-transition-couplings", "image": [ "https://indusiraq.com/assets/images/indus_logo.png" ], "description": "Stepped universal transition couplings DN50-DN1000 PN16 for joining pipes with differing outer diameters in legacy municipal water mains in Iraq. Staged.", "sku": "IND-PRD-000139", "mpn": "IND-PRD-000139", "brand": { "@type": "Organization", "@id": "https://indusiraq.com/division/water-wastewater#directorate", "name": "Indus Division 01: Water & Wastewater Engineering Directorate" }, "manufacturer": { "@type": "Organization", "@id": "https://indusiraq.com/division/water-wastewater#directorate", "name": "Indus Division 01: Water & Wastewater Engineering Directorate" }, "category": "Wide-Tolerance Couplings & Restraint Adapters", "additionalProperty": [ { "@type": "PropertyValue", "name": "Nominal Bore Sizes", "value": "DN50 to DN1000 (2\" to 40\") Standard Stepped Combinations" }, { "@type": "PropertyValue", "name": "Working Pressure Rating", "value": "PN16 (16 Bar continuous) / Shell Test 24 Bar" }, { "@type": "PropertyValue", "name": "Stepped Diameter Difference", "value": "Accommodates up to 30mm to 65mm step difference between pipe ODs" }, { "@type": "PropertyValue", "name": "Body Sleeve Material", "value": "Ductile Iron EN-GJS-450-10 (high tensile impact strength)" }, { "@type": "PropertyValue", "name": "Gasket Elastomer", "value": "EPDM (Potable Water WRAS approved) / NBR (Sewage & Hydrocarbons)" }, { "@type": "PropertyValue", "name": "Protective Coating", "value": "Thermal Fusion-Bonded Epoxy (FBE) min 250 μm (DIN 30677-2)" }, { "@type": "PropertyValue", "name": "Tie Rod Fasteners", "value": "High-Tensile Grade 8.8 Dacromet Coated Steel / Stainless Steel AISI 316" }, { "@type": "PropertyValue", "name": "Angular Deflection", "value": "Up to 3.0° to 4.0° per pipe end" }, { "@type": "PropertyValue", "name": "Governing Standards", "value": "EN 14525 / EN 545 / ISO 2531 / WRAS Approved" }, { "@type": "PropertyValue", "name": "Key Engineering Feature", "value": "Asymmetrical stepped center sleeve joining pipes with large outside diameter mismatches." }, { "@type": "PropertyValue", "name": "Key Engineering Feature", "value": "Ideal for connecting legacy thick-wall Asbestos Cement (AC) pipes to modern Ductile Iron & Steel." }, { "@type": "PropertyValue", "name": "Key Engineering Feature", "value": "Independent gasket compression on each end accommodating up to 4° angular misalignment." }, { "@type": "PropertyValue", "name": "Key Engineering Feature", "value": "High-tensile ductile iron body (EN-GJS-450-10) with fusion-bonded epoxy coating (min 250 μm)." }, { "@type": "PropertyValue", "name": "Key Engineering Feature", "value": "Molded EPDM sealing rings compliant with EN 681-1 providing drop-tight seal on corroded pipes." }, { "@type": "PropertyValue", "name": "Key Engineering Feature", "value": "Full compliance with European Standard EN 14525 and British Standard BS 545." }, { "@type": "PropertyValue", "name": "Approved Iraqi Project Applications", "value": "Connecting legacy asbestos cement water mains to modern ductile iron pipes, network renewal in old city centers, and emergency repair of non-standard diameter pipelines in Baghdad, Mosul, Basra, Kirkuk, and Najaf." } ], "aggregateRating": { "@type": "AggregateRating", "ratingValue": "4.9", "bestRating": "5", "worstRating": "1", "ratingCount": "48", "reviewCount": "32" }, "review": [ { "@type": "Review", "reviewRating": { "@type": "Rating", "ratingValue": "5", "bestRating": "5", "worstRating": "1" }, "author": { "@type": "Organization", "name": "Iraqi Industrial Quality & Standards Board" }, "datePublished": "2026-10-28T10:07:23+03:00", "reviewBody": "Factory Acceptance Testing (FAT) and hydrostatic pressure testing verified compliant with Iraqi ministry standards and ISO specifications." } ], "offers": { "@type": "Offer", "url": "https://indusiraq.com/product/stepped-universal-transition-couplings", "price": "0", "priceCurrency": "USD", "priceSpecification": { "@type": "UnitPriceSpecification", "price": "0", "priceCurrency": "USD", "description": "Commercial B2B procurement contract pricing based on project Bill of Quantities (BOQ). Official quotation provided upon RFQ." }, "priceValidUntil": "2027-12-31", "availability": "https://schema.org/InStock", "itemCondition": "https://schema.org/NewCondition", "description": "Commercial procurement pricing and material submittal available on official B2B Request for Quotation (RFQ). Pre-qualified for Iraqi ministry tenders.", "seller": { "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq", "telephone": "+9647508214490", "url": "https://indusiraq.com/", "logo": "https://indusiraq.com/assets/images/indus_logo.png" }, "areaServed": [ { "@type": "Country", "name": "Iraq", "identifier": "IQ" } ], "hasMerchantReturnPolicy": { "@type": "MerchantReturnPolicy", "applicableCountry": "IQ", "returnPolicyCategory": "https://schema.org/MerchantReturnFiniteReturnWindow", "merchantReturnDays": 30, "returnMethod": "https://schema.org/ReturnInStore", "returnFees": "https://schema.org/FreeReturn", "description": "30-day industrial quality inspection and factory acceptance testing (FAT) warranty. Return or replacement arranged via central regional staging yards in Iraq." }, "shippingDetails": { "@type": "OfferShippingDetails", "shippingDestination": { "@type": "DefinedRegion", "addressCountry": "IQ" }, "shippingRate": { "@type": "MonetaryAmount", "value": "0", "currency": "USD" }, "deliveryTime": { "@type": "ShippingDeliveryTime", "handlingTime": { "@type": "QuantitativeValue", "minValue": 1, "maxValue": 3, "unitCode": "DAY" }, "transitTime": { "@type": "QuantitativeValue", "minValue": 3, "maxValue": 14, "unitCode": "DAY" } } } }, "keywords": "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16) Iraq, Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16), stepped coupling iraq, asbestos to ductile stepped adapter baghdad, en 14525 stepped transition coupling basra, pipe od transition coupling erbil, ac pipe repair adapter mosul, water infrastructure iraq, ductile iron pipes baghdad, hdpe pipe supplier erbil, municipal water procurement iraq, grp sewer pipe basra, gate valve supplier iraq, water treatment chemicals baghdad, ministry of municipalities water tender", "audience": { "@type": "Audience", "audienceType": "Industrial Infrastructure Projects & Engineering Contractors", "description": "Connecting legacy asbestos cement water mains to modern ductile iron pipes, network renewal in old city centers, and emergency repair of non-standard diameter pipelines in Baghdad, Mosul, Basra, Kirkuk, and Najaf." }, "potentialAction": [ { "@type": "CommunicateAction", "name": "Instant WhatsApp Technical Desk - Indus Industrial Group (+964 750 821 4490)", "description": "Direct WhatsApp technical inquiry and pricing verification with Indus Industrial Group Senior Engineering Desk in Iraq for Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16) (SKU: IND-PRD-000139). Hotline: +964 750 821 4490.", "url": "https://wa.me/9647508214490?text=Official%20Inquiry%3A%20Stepped%20Universal%20Transition%20Couplings%20for%20Differing%20Outer%20Diameters%20%28DN50%E2%80%93DN1000%2C%20PN16%29%20%28SKU%3A%20IND-PRD-000139%29%20-%20Indus%20Industrial%20Group%20Iraq.%20Please%20provide%20technical%20datasheet%2C%20compliance%20certificates%2C%20and%20B2B%20project%20pricing.", "target": { "@type": "EntryPoint", "urlTemplate": "https://wa.me/9647508214490?text=Official%20Inquiry%3A%20Stepped%20Universal%20Transition%20Couplings%20for%20Differing%20Outer%20Diameters%20%28DN50%E2%80%93DN1000%2C%20PN16%29%20%28SKU%3A%20IND-PRD-000139%29%20-%20Indus%20Industrial%20Group%20Iraq.%20Please%20provide%20technical%20datasheet%2C%20compliance%20certificates%2C%20and%20B2B%20project%20pricing.", "inLanguage": "en", "actionPlatform": [ "http://schema.org/DesktopWebPlatform", "http://schema.org/MobileWebPlatform", "http://schema.org/IOSPlatform", "http://schema.org/AndroidPlatform" ] }, "recipient": { "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq", "telephone": "+964 750 821 4490" } }, { "@type": "AskAction", "name": "Request Official B2B Tender Quotation - Indus Iraq", "description": "Submit formal Bill of Quantities (BOQ) and engineering procurement parameters for Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16) directly to Indus Industrial Group Iraq Tender Desk.", "url": "https://indusiraq.com/rfq-submit?product=stepped-universal-transition-couplings&sku=IND-PRD-000139&source=ai_action", "target": { "@type": "EntryPoint", "urlTemplate": "https://indusiraq.com/rfq-submit?product=stepped-universal-transition-couplings&sku=IND-PRD-000139&source=ai_action", "inLanguage": "en", "actionPlatform": [ "http://schema.org/DesktopWebPlatform", "http://schema.org/MobileWebPlatform" ] }, "recipient": { "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq", "telephone": "+964 750 821 4490" } } ], "subjectOf": { "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#technical-brief" } }, { "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Corporate Holding", "item": "https://indusiraq.com/" }, { "@type": "ListItem", "position": 2, "name": "Division 01: Water & Wastewater", "item": "https://indusiraq.com/division/water-wastewater" }, { "@type": "ListItem", "position": 3, "name": "Wide-Tolerance Couplings & Restraint Adapters", "item": "https://indusiraq.com/category/wide-tolerance-couplings-restraint-adapters" }, { "@type": "ListItem", "position": 4, "name": "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16)", "item": "https://indusiraq.com/product/stepped-universal-transition-couplings" } ], "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#breadcrumbs" }, { "@type": "ItemPage", "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#webpage", "url": "https://indusiraq.com/product/stepped-universal-transition-couplings", "name": "Stepped Universal Transition Couplings | Indus Iraq", "description": "Stepped universal transition couplings DN50-DN1000 PN16 for joining pipes with differing outer diameters in legacy municipal water mains in Iraq. Staged.", "inLanguage": "en", "isPartOf": { "@type": "WebSite", "@id": "https://indusiraq.com/#website", "name": "Indus Industrial Group - Iraq", "url": "https://indusiraq.com/" }, "author": { "@type": "Organization", "@id": "https://indusiraq.com/division/water-wastewater#directorate", "name": "Indus Division 01: Water & Wastewater Engineering Directorate" }, "publisher": { "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq", "logo": { "@type": "ImageObject", "url": "https://indusiraq.com/assets/images/indus_logo.png" } }, "mainEntity": { "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#product" }, "breadcrumb": { "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#breadcrumbs" }, "keywords": "Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16) Iraq, Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16), stepped coupling iraq, asbestos to ductile stepped adapter baghdad, en 14525 stepped transition coupling basra, pipe od transition coupling erbil, ac pipe repair adapter mosul, water infrastructure iraq, ductile iron pipes baghdad, hdpe pipe supplier erbil, municipal water procurement iraq, grp sewer pipe basra, gate valve supplier iraq, water treatment chemicals baghdad, ministry of municipalities water tender" }, { "@type": "TechArticle", "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#technical-brief", "headline": "Technical Field Evaluation: Stepped Universal Transition Couplings for Differing Outer Diameters (DN50–DN1000, PN16)", "name": "Engineering Datasheet & Field Compliance Dossier", "description": "Urban pipeline rehabilitation projects in historical Iraqi cities like Baghdad, Mosul, Kirkuk, and Basra frequently encounter legacy pipelines where the outside diameter difference between the...", "articleBody": "Urban pipeline rehabilitation projects in historical Iraqi cities like Baghdad, Mosul, Kirkuk, and Basra frequently encounter legacy pipelines where the outside diameter difference between the existing buried pipe and modern replacement pipe exceeds the tolerance range of a standard straight coupling. Stepped Universal Transition Couplings provide an engineered solution by stepping the center sleeve casting and utilizing different gasket diameters on either end.\n\nManufactured from high-tensile spheroidal graphite ductile iron (EN-GJS-450-10) coated with minimum 250 microns of WRAS-approved fusion-bonded epoxy, each end of the stepped coupling operates independently. The large-diameter end accommodates heavy Class 20 or Class 25 Asbestos Cement pipes (which have exceptionally thick walls), while the small-diameter end seals tightly around modern ISO 2531 ductile iron or steel pipe.\n\nThe dual EPDM rubber sealing rings are molded with deep multi-stage sealing ribs that seal drop-tight even on pitted, grooved, or out-of-round pipe surfaces common in legacy networks. Long stainless steel or galvanized tie bolts span across the center sleeve, allowing field crews to tighten the fitting uniformly in cramped trenches. Staged in popular transition sizing combinations at Indus Erbil and Baghdad central depots.", "image": [ "https://indusiraq.com/assets/images/indus_logo.png" ], "datePublished": "2026-09-11T23:14:11+03:00", "dateModified": "2026-10-28T10:07:23+03:00", "author": { "@type": "Organization", "@id": "https://indusiraq.com/division/water-wastewater#directorate", "name": "Indus Division 01: Water & Wastewater Engineering Directorate" }, "publisher": { "@type": "Corporation", "@id": "https://indusiraq.com/#corporation", "name": "Indus Industrial Group - Iraq", "logo": { "@type": "ImageObject", "url": "https://indusiraq.com/assets/images/indus_logo.png" } }, "inLanguage": "en", "about": { "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#product" } }, { "@type": "FAQPage", "@id": "https://indusiraq.com/product/stepped-universal-transition-couplings#faq", "mainEntity": [ { "@type": "Question", "name": "When is a stepped coupling needed instead of a standard universal coupling?", "acceptedAnswer": { "@type": "Answer", "text": "A stepped coupling is required when the difference between the two pipe outside diameters exceeds 40mm (such as connecting a Class 25 Asbestos Cement pipe to a modern thin-walled steel pipe), where a straight coupling cannot clamp both sides evenly." } }, { "@type": "Question", "name": "Can stepped couplings handle pitted or uneven surfaces on old iron pipes?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Our EPDM gaskets feature thick, multi-ribbed sealing geometry that deforms deeply into surface irregularities, scratches, and minor pitting on old cast iron and concrete surfaces to guarantee watertightness." } }, { "@type": "Question", "name": "Are tie bolts resistant to aggressive sulfurous groundwater in Iraq?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We supply high-tensile steel bolts treated with anti-corrosion Dacromet coating plus zinc plating, or optional marine-grade AISI 316 stainless steel bolts for extreme soil environments." } } ] } ] } }