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China Factory NSF/UPC Certified SS301/304 Stainless Steel No Hub Couplings 1.5-15 - Top Suppliers for Plumbing Solutions
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
What certifications does the TJTC no-hub coupling hold?
The TJTC no-hub coupling is certified with NSF, UPC, and CSA approvals, ensuring compliance with North American plumbing codes and construction standards in both the USA and Canada.
What are the primary materials used in this cast iron soil pipe coupling?
It features a 304 stainless steel shield and double worm drive clamps for high corrosion resistance, combined with an internal sealing gasket made of NSF-certified EPDM or chloroprene rubber.
What temperature range can the internal EPDM rubber sleeve withstand?
The internal EPDM rubber sleeve is highly durable and engineered to resist aging, chemical erosion, and temperature fluctuations ranging from -30 ℃ to 100 ℃.
What sizes are available for the TJTC no-hub coupling?
The coupling is available in standard dimensional specifications ranging from 2 inches to 12 inches, matching mainstream US cast iron soil pipe sizes.
Why is a double-clamp design preferred over single-band types?
The double-clamp design provides a stronger and more uniform clamping force compared to single-band types, which guarantees a stable, leakproof seal under ground burial or high-temperature indoor environments.
Is this coupling suitable for industrial wastewater systems?
Yes. Due to the chemical resistance of its EPDM rubber sleeve, it is suitable for low-concentration industrial wastewater discharge piping in food processing plants and light manufacturing factories.