4 inch x 3 inch Proflex Reducing Coupling Connects Copper to Cast Iron, PVC, Steel

4 inch x 3 inch ProFlex Flexible Reducing Coupling – Engineered for Transition Integrity

The 4 inch x 3 inch ProFlex Flexible Reducing Coupling is designed for permanent or temporary transitions between dissimilar DWV piping systems. With a stainless steel shielded body and flexible elastomeric sleeve, this coupling accommodates minor pipe misalignments while maintaining a positive seal across copper, cast iron, steel, and plastic piping materials.

Engineered for underground and above-ground applications, the coupling is constructed to meet ASTM C1173 and CSA B602 specifications. Its stainless-steel clamp assembly ensures uniform pressure across the connection, critical for maintaining system integrity under variable pressure and temperature conditions.

Key Performance Features

• ✅ Shielded Design – Stainless steel clamp band prevents shear force distortion and supports buried installations.
• ✅ Elastomeric Sleeve – EPDM or neoprene sleeve provides flexibility while maintaining a watertight seal.
• ✅ Multi-Material Transition – Compatible with Schedule 40 DWV PVC, cast iron, ABS, steel, and copper piping.
• ✅ Leak-Resistant Clamps – 300-series stainless-steel clamps with hex screws ensure torque uniformity and secure fitment.
• ✅ Code-Conforming – Manufactured to comply with national and regional plumbing codes including IPC, UPC, and IAPMO listings.

Technical Specifications

• Coupling Size: 4 inch x 3 inch nominal pipe diameter
• Material: Elastomeric sleeve with 300-series stainless steel shear band and clamps
• Temperature Range: -30°F to 140°F service range (continuous)
• Certification: ASTM C1173, CSA B602, UPC listed

Installation Requirements

Installation requires a torque-controlled driver (60 in-lbs recommended) to evenly tighten clamp bands to spec. No adhesive or solvent welding is required, though pipe ends must be clean and free from debris. Ideal for confined spaces and repair scenarios where rigid fittings are impractical.

Common Applications

The ProFlex 4 inch x 3 inch reducing coupling is used in gravity-flow DWV systems, including sanitary stacks, branch lines, and retrofit connections between existing and upgraded piping materials. It is also suitable for vertical and horizontal transitions in commercial and residential projects.

Additional Information

ProFlex couplings are often preferred for remodel and repair work due to their ease of alignment and ability to absorb system vibration. Their resistance to chemical exposure and durability in wet environments makes them well suited for underground installations as well.

For reliable pipe transitions between different materials and sizes, the 4 inch x 3 inch ProFlex Shielded Coupling offers an efficient, code-compliant solution trusted in professional-grade installations.