6 inch x 4 inch Flexible Banded Reducing Coupling Clay x Cast Iron PVC or Steel Pipe

6 inch x 4 inch Banded Flexible Reducing Coupling – For Clay, Cast Iron, PVC, and Steel Pipe Transitions

The 6 inch x 4 inch banded reducing coupling is designed to connect dissimilar or same-material pipes of varying diameters in gravity-flow, non-pressurized drain, waste, and vent (DWV) systems. Engineered with an elastomeric sleeve and stainless steel shear band, this fitting provides structural reinforcement while maintaining flexibility for pipe misalignment and expansion/contraction movement.

This coupling is intended for use in both above-grade and below-grade applications, and is suitable for transitions between materials such as cast iron, clay, PVC, ABS, and steel. The banded design meets performance requirements for buried installations, supporting soil load and minimizing pipe movement under shear stress.

Technical Specifications

• Size: 6 inch x 4 inch nominal pipe diameter
• Sleeve Material: Flexible elastomer (PVC or neoprene, ASTM C1173 compliant)
• Clamp Bands: 300-series stainless steel with shear ring reinforcement
• Clamp Tightening Torque: 60 in-lbs per ASTM requirements
• Temperature Range: -30°F to 140°F (non-pressure systems)
• Standards Compliance: ASTM C1173, CSA B602, and UPC listed

Application Areas

Designed for DWV systems in residential, commercial, and municipal installations, including:

• • Underground and above-ground gravity-flow drainage
• • Retrofitting and repair of existing mixed-material systems
• • Transitions between hubless cast iron and SDR or Schedule 40 PVC/ABS
• • Municipal sewer laterals and stormwater drainage tie-ins

Installation Guidelines

Install on clean, properly cut pipe ends. Center the coupling over the joint and tighten stainless steel clamps to manufacturer-recommended torque specifications using a torque wrench. For buried installations, ensure the coupling includes an external shear band to comply with plumbing and building codes for underground systems. Do not use in pressurized applications.

Code Notes

Banded flexible couplings with stainless steel shear rings are required by IPC and UPC when used below grade or in areas subject to backfill. These fittings provide axial restraint and protect joint integrity during soil settlement and pipe deflection.