4 inch No Hub Soil Coupling

4" No Hub Coupling – Stainless Steel Shielded Coupler for Cast Iron DWV Systems

The 4" No Hub Coupling is a shielded transition fitting designed for joining 4" no-hub cast iron pipe in sanitary and storm drainage systems. This coupling conforms to ASTM and CISPI standards, offering consistent sealing performance, structural support, and ease of installation in both horizontal and vertical configurations.

Constructed with a stainless steel shield and galvanized or stainless steel clamps, this coupling provides axial compression and shear resistance in high-traffic or vibration-sensitive piping environments. It is typically specified for commercial, industrial, and multi-residential drainage systems where code-compliant performance and mechanical strength are required.

Key Performance Attributes

• ✅ Shielded Design – Includes a stainless steel outer shield and worm gear clamps to control expansion and maintain alignment under thermal or load variation.
• ✅ Elastomeric Gasket – Molded EPDM or neoprene sleeve provides a tight seal around pipe ends, resisting chemical degradation and microbial attack.
• ✅ Torque-Controlled Clamping – Band clamps allow uniform sealing pressure, ensuring watertight joints under system pressures typically up to 10–13 PSI.
• ✅ Code Compliant – Engineered and certified to meet ASTM C1277, CISPI 310, and NSF/ANSI 14 performance criteria.
• ✅ Corrosion-Resistant Hardware – Components made of 300-series stainless steel for long-term use in high-humidity or buried conditions.

Specifications

• Nominal Size: 4”
• Connection Type: No-Hub (Cast Iron Pipe)
• Gasket Material: EPDM or Neoprene (ASTM C564 compliant)
• Shield Material: Stainless Steel (Type 301/304)
• Clamp Bands: 60 in-lb torque rating (typical)
• Certifications: ASTM C1277, CISPI 310, NSF 14, UPC Listed

Typical Applications

Used in cast iron soil pipe systems for sanitary waste, storm drainage, and vent piping in commercial buildings, schools, healthcare facilities, and multifamily residential projects. Common in under-slab installations, vertical risers, and horizontal branch lines.

Installation Notes

Install using a calibrated torque wrench per manufacturer specifications (typically 60 in-lbs per clamp). Ensure gasket alignment and equal spacing between pipe ends. No solvent, primer, or additional sealing compounds are required. Inspect visually and pressure test per local code after assembly.

Material & Compliance Notes

Stainless steel components resist corrosion and galvanic degradation when installed with cast iron. EPDM gaskets are rated for contact with a wide range of domestic wastewater and condensate drainage fluids. Product complies with IPC, UPC, and ASTM standards required for DWV installations.