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

3” Fernco ProFlex Shielded Coupling – Built for Code-Compliant Transitions

The 3” Fernco ProFlex Shielded Coupling is engineered to connect pipes of the same diameter made from dissimilar materials, including cast iron, copper, steel, and schedule 40 PVC. Constructed to meet ASTM C1460 standards and UPC listed, this coupling provides a secure, code-compliant solution for above-ground or underground DWV applications.

Its stainless steel shield and clamps provide added structural support, limiting shear force and maintaining alignment during and after installation. The inner elastomeric sleeve creates a tight, uniform seal around pipe surfaces, supporting system integrity even under pressure changes or ground movement.

Performance Features

• ✅ Shear Band Reinforcement – Built-in 300-series stainless steel band prevents joint separation and maintains concentricity during pipe movement.
• ✅ Flexible EPDM Gasket – Designed to accommodate dimensional tolerances across a range of piping materials while ensuring watertight performance.
• ✅ Stainless Steel Clamps – Pre-attached torque clamps simplify installation and provide consistent, even compression around the joint.

Technical Specifications

• Nominal Size: 3 inches
• Pipe Compatibility: Cast iron, copper, steel, and schedule 40 PVC
• Gasket Material: EPDM elastomer
• Shield & Clamp Material: 300-series stainless steel
• Conformance: ASTM C1460, CSA B602, UPC-listed

Typical Applications

This coupling is frequently used in drain, waste, and vent systems where dissimilar materials are joined during repairs, retrofits, or transitions in vertical and horizontal lines. It is suitable for both commercial and residential installations requiring reliable joint strength and flexibility under load.

Installation Guidelines

Installation is completed using a torque wrench set to manufacturer-specified values (typically 60 in-lbs) to ensure uniform clamp tension. No solvent cement or primers are required, making it ideal for time-sensitive jobs. Always verify dimensional compatibility and pipe end preparation to meet local code requirements and ensure proper sealing performance.

Did You Know?

Shielded couplings such as the Fernco ProFlex series are often mandated by code when connecting cast iron to PVC in above-ground DWV systems, due to their superior resistance to shear force compared to unshielded alternatives.

Whether for new installations or complex transitions, the 3” Fernco ProFlex Shielded Coupling delivers consistent performance and mechanical reliability in the field. It's a durable, code-approved solution for professionals managing diverse piping systems.