1-1/4 inch Flexible Banded Coupling Cast Iron or PVC x Cast Iron or PVC

1-1/4 inch Flexible Banded Coupling – Transition Fitting for DWV and Sewer Applications

The 1-1/4 inch Flexible Banded Coupling is a rubber-based plumbing connector with stainless steel band clamps, engineered for joining piping systems where dissimilar materials or dimensional tolerances exist. Commonly used in gravity-flow drain, waste, and vent (DWV) systems, it provides a secure, code-compliant transition between cast iron, PVC, ABS, or steel pipes.

This coupling meets performance requirements for structural strength and sealing reliability under typical non-pressurized operating conditions. Its elastomeric body absorbs minor pipe misalignment and expansion/contraction movement, reducing system stress and the likelihood of joint failure.

Key Product Features

• ✅ Elastomeric Body – Manufactured from flexible PVC or neoprene for durability and vibration absorption.
• ✅ Stainless Steel Bands – Mechanically fastens the coupling around the pipe circumference, maintaining a uniform seal.
• ✅ Versatile Compatibility – Designed to connect 1-1/4 inch nominal pipe across material types (PVC, cast iron, steel, ABS).
• ✅ Code-Compliant – Meets applicable plumbing and mechanical code standards including ASTM C1173 and CSA B602.
• ✅ Tool-Accessible Installation – Clamps can be torqued using a socket or nut driver; no solvent welding or threading required.

Installation Considerations

Verify that mating pipes are clean, round, and properly cut to length. Slide the coupling over one pipe end, then bring the second pipe into position before tightening both stainless bands evenly to the specified torque (typically 60 in-lbs, per manufacturer instructions). For buried or exposed installations, follow local code provisions regarding banded coupling use and reinforcement requirements.

Typical Applications

• Transitioning between old and new piping materials during system upgrades or repairs
• Connecting PVC to cast iron in residential DWV stacks
• Utility tie-ins and trap arm connections in confined locations

Material Insight

Flexible couplings are preferred for their ease of installation and their ability to accommodate thermal expansion, pipe movement, and mechanical vibration—making them well suited for retrofits and utility spaces where rigid fittings are impractical.

Technical Specifications

• Nominal Size: 1-1/4 inch
• Body Material: Flexible PVC or Neoprene (depending on model)
• Clamp Material: 300 Series Stainless Steel
• Connection Type: Mechanical – Banded
• Standards: ASTM C1173, CSA B602, UPC/IAPMO listed

The 1-1/4 inch Flexible Banded Coupling provides a practical solution for connecting dissimilar materials in non-pressurized plumbing systems. Designed for durability and ease of use, it is an essential component in residential, commercial, and industrial drainage installations where alignment flexibility and sealed performance are required.