3 inch Flexible Cap (Copper Cast Iron PVC or Steel Pipe)

Fernco QC-103 Flexible Qwik Cap – Engineered for Sealing 3" CI, Plastic, Steel, and Copper Lines

The Fernco QC-103 Flexible Qwik Cap is a professional-grade termination solution for sealing open-ended 3" piping in cast iron, plastic (PVC/ABS), steel, and copper systems. Its versatile fit and robust EPDM rubber body make it ideal for temporary or permanent pipe closures in both residential and commercial drainage and vent systems.

Key Advantages for Professional Applications

• Flexible Compatibility – Designed to securely cap 3" nominal pipe sizes across multiple materials, including CI, PVC, ABS, galvanized steel, and copper.
• Watertight Seal – Engineered from elastomeric EPDM rubber for reliable performance under positive or negative pressure conditions in DWV systems.
• Stainless Steel Clamp – Features a corrosion-resistant 300-series stainless steel band for uniform compression and long-term durability.
• Non-Threaded Design – Ideal for applications requiring slip-on installation without threaded pipe ends.
• Reusable and Removable – Suitable for testing, temporary closures, or permanent installations with straightforward removal when needed.

Technical Specifications

• Model: QC-103
• Nominal Pipe Fit: 3"
• Material: EPDM Rubber Cap with Stainless Steel Clamp
• Temperature Range: -30°F to 140°F continuous service
• Conforms to: ASTM C1173 and CSA B602 standards for elastomeric connections in DWV systems

Installation Notes

Ensure the pipe end is clean and free from debris prior to installation. Slide the cap over the pipe and tighten the clamp to the specified torque using a torque screwdriver or nut driver (typically 60 in-lbs). Do not overtighten, as this may damage the fitting or compromise the seal. For use in vertical or horizontal applications not under constant pressure.

Common Use Cases

The QC-103 is widely used in plumbing and mechanical trades for terminating open lines during pressure testing, isolating unused branches, or sealing off stub-outs in renovations. It is well-suited for underground and above-ground DWV applications, including basement rough-ins and main line cleanouts.

Did You Know?

Flexible caps like the QC-103 are ideal for test-and-cap installations, providing fast, tool-less removal for future tie-ins without cutting or damaging existing lines.

The Fernco QC-103 delivers versatility, performance, and compliance with industry standards—making it a dependable solution for any job requiring secure, adaptable pipe terminations.