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China Suppliers TJTC Stainless Steel No Hub Coupling Factory - NSF UPC CSA Certified for DWV Drain Waste Vent Systems
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
✅ Standards – CISPI 310, ASTM C1277, fully acceptable for US & Canada building project acceptance
Key Features & Benefits
- Excellent Flexible Compensation: neoprene/EPDM liner allows minor pipe misalignment, thermal expansion and vibration damping, effectively prevent pipe joint cracking and leakage.
- Simple Fast Installation: No lead pouring, welding or flanging required; just align pipes and tighten bolts with a torque wrench, cut construction labor cost greatly.
- Multi-material Compatibility: Connect hubless cast iron pipe, PVC drain pipe, ABS pipe interchangeably for renovation and new construction.
- Heavy-duty Anti-extrusion Shield: Corrugated stainless steel outer cover avoids rubber gasket extrusion under soil pressure for underground buried pipelines.
- Noise Reduction: Cushioned rubber structure isolates water flow vibration, lowers drainage noise inside buildings.
- Wide Application Temperature: Stable sealing performance under -30℃ ~ 100℃ working environment.
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.
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Frequently Asked Questions (FAQ)
What is a No Hub Coupling?
A No Hub Coupling (also known as a mechanical joint or MJ coupling) is a flexible connector used to join hubless cast iron pipes and fittings in DWV plumbing systems. It consists of an inner rubber gasket and a protective stainless steel outer shield with clamps.
Are TJTC No Hub Couplings certified for North American building projects?
Yes, our couplings are fully certified and compliant with North American standards, including NSF/ANSI 14, UPC (Uniform Plumbing Code), and CSA. They meet industry standards CISPI 310 and ASTM C1277, making them suitable for official engineering inspections.
Can these couplings connect cast iron pipes to PVC or ABS?
Yes, TJTC No Hub Couplings offer excellent multi-material compatibility. They can be used interchangeably to connect hubless cast iron pipes, PVC drain pipes, and ABS pipes, which is ideal for both new installations and retrofitting older systems.
What are the main materials used in TJTC couplings?
The outer shield and clamp bands are constructed from premium 304 stainless steel to prevent rust and corrosion. The inner sealing gasket is made of high-performance EPDM rubber (or optional CR neoprene) which offers superior resistance to wastewater, aging, and temperature changes.
What sizes do you offer?
We supply a complete range of standard sizes from 1-1/2" (1.5 inches) up to 15" to accommodate all standard pipe diameters used in residential and commercial drainage projects.
What is the working temperature range for these couplings?
TJTC No Hub Couplings maintain a stable, leak-proof seal within a wide working temperature range of -30℃ to 100℃, ensuring reliable performance in both indoor and underground environments.