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China TJTC Stainless Steel No Hub Coupling - NSF UPC CSA Certified DWV Drain Waste Vent Suppliers & Factory
Product Overview
- Our TJTC No Hub Coupling (also known as mechanical joint coupling / MJ coupling) is a professional flexible pipe connector designed for hubless cast iron drainage pipelines, widely used in drain, waste and vent (DWV) plumbing systems in North America.
- The integrated corrugated stainless steel shield evenly distributes clamping pressure, protects the rubber liner from external impact and underground soil corrosion, while the elastic rubber gasket offers great deflection, vibration absorption and leak-proof sealing performance.
Material Construction
- Outer Shield & Clamp Band: Premium 304 stainless steel, anti-rust, acid & sewage resistant, long service life for buried & above-ground installation.
- Fastener Bolt & Nut: Stainless steel screw assembly, stable clamping force, easy torque tightening without special tools.
- Inner Sealing Gasket: High-performance EPDM rubber, resistant to wastewater, aging and temperature fluctuation; optional CR neoprene gasket available.
- Structure Type: Single clamp / double clamp shielded coupling, sizes range from 1-1/2" to 15" inch to meet all standard pipe diameters.
Certifications & Compliance (Core Advantage)
All TJTC no hub couplings pass strict third-party testing and hold full North American official certifications for engineering inspection:
NSF/ANSI 14 – National Sanitation Foundation certification for plumbing contact with potable & waste water
UPC – Uniform Plumbing Code certification, meets US domestic plumbing construction codes
CSA – Canadian Standards Association certification, eligible for Canadian construction projects
Industry Standards: CISPI 310, ASTM C1277, fully acceptable for US & Canada building project acceptance
Key Features & Benefits
Flexible Compensation
Neoprene/EPDM liner allows minor pipe misalignment, thermal expansion, and vibration damping, effectively preventing pipe joint cracking and leakage.
Simple Fast Installation
No lead pouring, welding, or flanging required; align pipes and tighten bolts with a torque wrench to reduce construction labor costs.
Multi-material Compatible
Connect hubless cast iron pipe, PVC drain pipe, and ABS pipe interchangeably for renovation and new construction.
Anti-extrusion Shield
Corrugated stainless steel outer cover avoids rubber gasket extrusion under soil pressure, ideal for underground buried pipelines.
Noise Reduction
Cushioned rubber structure isolates water flow vibration, lowering drainage noise inside buildings.
Temperature Resilience
Stable sealing performance under -30℃ to 100℃ working environments.
Application Scenarios
- Residential high-rise DWV drain, waste and vent pipelines.
- Commercial buildings: hospital, hotel, shopping mall, office basement drainage system.
- Underground buried cast iron sewage pipe network.
- Old building cast iron pipeline repair & renovation.
- Cross-material pipe transition connection (cast iron to PVC/ABS).
- North America export plumbing engineering projects (USA, Canada mainstream drainage fitting).
Product Specifications
- Available Sizes: 1.5", 2", 3", 4", 5", 6", 8", 10", 15" inch
- Standard Gasket: Black EPDM rubber/neoprene
- Optional Accessory: Stainless steel repair clamps, pipe hangers, coupling accessories
- Packaging: Carton packaging with inner plastic bag, customizable logo & label printing
Frequently Asked Questions
What is a No Hub Coupling used for?
A No Hub Coupling (also known as a mechanical joint or MJ coupling) is a flexible pipe connector designed to join hubless cast iron pipes and fittings in drain, waste, and vent (DWV) plumbing systems.
Are TJTC No Hub Couplings compliant with North American standards?
Yes. All TJTC no hub couplings are fully certified and compliant with North American standards, including NSF/ANSI 14, UPC (Uniform Plumbing Code), CSA (Canadian Standards Association), CISPI 310, and ASTM C1277.
Can this coupling connect cast iron pipes to PVC or ABS pipes?
Yes, TJTC No Hub Couplings feature multi-material compatibility, allowing you to seamlessly transition and connect hubless cast iron pipes to PVC or ABS drain pipes in both new installations and retrofitting projects.
What are the advantages of EPDM vs Neoprene gaskets?
EPDM rubber offers excellent resistance to aging, wastewater, and temperature fluctuations, making it ideal for standard DWV systems. Neoprene (CR) provides enhanced oil and chemical resistance, which may be preferred in specific commercial or industrial applications.
Do I need special tools to install these couplings?
No special tools are required. The stainless steel clamp assembly is designed for fast and easy installation using a standard torque wrench to tighten the hex head screws to the recommended torque rating.