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

4" Flexible Qwik Cap – PVC End Seal for Drainage and Testing Applications

The 4" Flexible Qwik Cap is a versatile PVC end cap designed for temporary or permanent sealing of 4-inch nominal DWV (Drain, Waste, Vent) pipe. Commonly used in both new construction and repair settings, it fits over hub or spigot pipe ends and is secured with a stainless-steel clamp to create a watertight seal.

This cap provides a fast, reliable solution for pressure testing, line capping during construction phases, and sealing unused pipe runs. It is compatible with PVC, ABS, cast iron, and other standard pipe materials within specified dimensional tolerances.

Product Design and Technical Features

• ✅ Flexible PVC Construction – Provides adaptability for non-uniform pipe surfaces and minor out-of-round pipe ends.
• ✅ Stainless Steel Clamping Band – Ensures uniform compression around the pipe circumference, delivering a consistent seal under pressure.
• ✅ Watertight and Air-Test Rated – Suitable for use in systems requiring temporary or permanent closure for inspection or maintenance.
• ✅ Code-Compliant – Meets or exceeds applicable ASTM and CSA standards for mechanical couplings and end caps.

Installation Requirements

Install directly over the pipe end or fitting. Ensure the pipe surface is clean and free of debris before placing the cap. Tighten the stainless steel clamp using a torque wrench or nut driver to the manufacturer’s specified torque value (commonly 60 in-lbs). Do not overtighten. No solvent cement or primer is required, allowing for quick removal if future access is needed.

Typical Use Cases

This 4" flexible cap is widely used in the following applications:

• • Sealing DWV pipe ends during testing procedures
• • Capping open stubs in rough-in plumbing installations
• • Isolating unused or abandoned pipe sections
• • Temporary seals during phased construction or inspections

Installation Note

Flexible caps are ideal for retrofit and repair work, especially in confined spaces or where tools for solvent connections are impractical. Their non-permanent nature allows for easy disassembly or reconfiguration of systems as needed.

Technical Specifications

• Nominal Size: 4”
• Material: Flexible PVC Body, 300-series Stainless Steel Clamp
• Connection Type: Push-fit with clamp seal
• Compliance: ASTM C1173, CSA B602
• Use: Non-pressure DWV and test systems

The 4" Flexible Qwik Cap is a durable, field-proven component that meets the needs of plumbing professionals handling temporary closures, test caps, or capped stub-outs. Its ease of use, secure fit, and reusability make it a valuable tool across a range of residential and commercial system installations.