NSF/UPC Certified SS301/304 Stainless Steel No Hub Couplings Factory in China - Reliable Suppliers for 1.5-15 Sizes
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
Sanitary Drainage System
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.
Municipal & Civil Engineering
Underground sewage pipeline connection for municipal drainage, basement waste water discharge and underground parking lot drainage pipelines.
Industrial Wastewater Project
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
QWhat plumbing codes does the TJTC no-hub coupling comply with?
The TJTC no-hub coupling is certified with NSF, UPC, and CSA approvals, ensuring full compliance with North American plumbing codes for sanitary drainage systems.
QWhat materials are used in this cast iron soil pipe coupling?
It features high-grade 304 stainless steel for the outer band, clamps, bolts, and nuts, combined with an internal sealing gasket made of NSF-certified EPDM/chloroprene rubber.
QWhat sizes are available for the TJTC no-hub coupling?
Standard dimensional specifications range from 2" to 12", perfectly matching mainstream US cast iron soil pipe sizes.
QCan this coupling withstand extreme temperatures?
Yes, the internal EPDM/chloroprene rubber gasket is designed to handle temperature fluctuations ranging from -30 ℃ to 100 ℃, making it suitable for high-temperature indoor drainage.
QWhy is a double-clamp design preferred over a single-band type?
The double-clamp design delivers stronger and more even clamping force, ensuring a highly stable and leakproof seal under ground burial or demanding indoor environments.
QIs this coupling suitable for industrial wastewater applications?
Yes, thanks to the chemical resistance of the EPDM rubber gasket, it is compatible with low-concentration industrial wastewater, including dilute acid and alkali sewage.