China Suppliers Factory NSF/UPC Certified SS301/304 Stainless Steel No Hub Couplings for Cast Iron Pipes 1.5-15
Product Introduction
This TJTC no-hub coupling, also called cast iron soil pipe coupling, is certified with NSF, UPC & CSA approvals to meet North American plumbing codes. It is equipped with double stainless steel worm drive clamps on both sides, the serrated steel band can evenly compress the inner EPDM rubber sleeve to form a tight leakproof seal for connecting hubless cast iron drain pipes. Double-clamp design delivers stronger clamping force than single-band types, ensuring stable sealing under ground burial or high-temperature indoor drainage environments. Standard dimensional specifications range from 2" to 12", matching mainstream US cast iron soil pipe sizes.
Material Specification
- Stainless steel 304, with embossed serrated texture and uniform pressure distribution, has excellent rust prevention performance against damp sewage and underground soil corrosion.
- Internal sealing gasket: NSF certified EPDM/chloroprene rubber, resistant to aging, chemical erosion from sewage, and temperature fluctuations from -30 ℃ to 100 ℃, in compliance with US drinking water and hygiene standards.
- Fastener bolts and nuts: 304 stainless steel, treated with anti-corrosion, suitable for long-term outdoor and underground installation.
Similar Products
- Single Band No-Hub Coupling: Only one stainless steel clamp, for low-load indoor above-ground drainage with lower cost.
- Transition Coupling: One end for cast iron pipe, the other for PVC/ABS plastic pipe, used for mixed-material pipeline conversion.
- Flexible Expansion Coupling: With thicker rubber body to absorb pipeline thermal expansion and building settlement displacement.
- Compression Shield Coupling: Extra outer steel shield for heavy-duty underground burial projects.
Application Scope
Primary connection fitting for hubless cast iron drainage pipes in residential buildings, apartments, commercial malls and hotels across USA & Canada, UPC/NSF certification is required for local plumbing inspection approval.
Underground sewage pipeline connection for municipal drainage, basement waste water discharge and underground parking lot drainage pipelines.
Low-concentration industrial wastewater discharge piping for food processing plants and light manufacturing factories, compatible with acid/alkali dilute sewage due to EPDM rubber chemical resistance.
Certification Notes
- NSF: National Sanitation Foundation certification, qualified for potable water & sanitary drainage application.
- UPC: Uniform Plumbing Code certification, mandatory for US local plumbing engineering acceptance.
- CSA: Canadian Standards Association certification, eligible for Canada market clearance & construction inspection.
Packaging and Transportation
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Frequently Asked Questions (FAQ)
What certifications do TJTC no-hub couplings hold?
TJTC no-hub couplings are certified with NSF, UPC, and CSA approvals, ensuring compliance with strict North American plumbing codes for civil, municipal, and commercial installations.
What materials are used for the sealing gasket and clamps?
The outer bands, clamps, and fasteners are made of high-grade 304 stainless steel for superior rust prevention. The internal sealing gasket is made of NSF-certified EPDM/chloroprene rubber, which offers exceptional resistance to aging and temperature fluctuations ranging from -30 ℃ to 100 ℃.
What are the available sizes for these couplings?
Our standard dimensional specifications range from 2" to 12", aligning perfectly with mainstream cast iron soil pipe sizes used in North American plumbing projects.
Why is the double-clamp design preferred over single-band types?
The double stainless steel worm drive clamps on both sides deliver a significantly stronger and more uniform clamping force. This ensures a highly stable, leakproof seal that withstands high temperatures and underground soil settlement.
Can these couplings handle industrial wastewater?
Yes. Thanks to the chemical resistance of the EPDM rubber gasket, they are suitable for low-concentration industrial wastewater drainage systems, such as those in food processing plants and light manufacturing facilities.