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

Fernco QC-105 5" Flexible Qwik Cap – Non-Permanent Pipe Termination Solution

The Fernco QC-105 Flexible Qwik Cap is a removable cap used to seal the end of 5" nominal piping during pressure testing, maintenance, or temporary shutoff. Molded from elastomeric PVC and secured with a stainless steel clamp, this cap conforms to irregular surfaces and forms a tight seal on cast iron, PVC, copper, or steel pipe.

Designed for non-pressurized drain, waste, and vent systems, this flexible cap is frequently used in both new construction and renovation applications where line termination is needed without permanent glue or welding. It meets requirements for mechanical joint seals under applicable plumbing and mechanical codes.

Performance and Design Features

• ✅ Flexible PVC Construction: Conforms to pipe irregularities for an effective seal; suitable for above- and below-grade use.
• ✅ Stainless Steel Torque Clamp: Mechanically secures the cap with uniform pressure around the pipe circumference.
• ✅ Tool-Free Removal: Cap can be loosened and removed without cutting or damaging the pipe, enabling future system access.
• ✅ Multi-Material Compatibility: Installs on cast iron, steel, copper, or Schedule 40/80 PVC pipes of matching nominal size.

Specifications

• Model: Fernco QC-105
• Nominal Size: 5 inches
• Material: Elastomeric PVC (Cap) with 300-series stainless steel clamp
• Temperature Range: -30°F to 140°F (intermittent)
• Application: Gravity-flow DWV systems; not intended for pressurized lines

Installation Requirements

Ensure that the pipe end is cut square and cleaned of debris. Slide the cap fully over the pipe end and tighten the stainless steel clamp using a torque wrench to the manufacturer's specified inch-pounds (typically 60 in-lbs). Do not overtighten. This product is not rated for permanent pressurized use and must not be used in potable water distribution systems under pressure.

Common Applications

Used to seal open pipe ends in drain, waste, and vent systems, especially in stub-out locations, cleanout access points, or temporary system isolation during pressure testing. Often used during inspection phases or in systems awaiting final connection to downstream components.

Regulatory Note

Flexible caps such as the QC-105 are typically approved for use in plumbing systems per IPC and UPC guidelines when used in gravity-only systems. Always verify with the authority having jurisdiction (AHJ) before use in code-regulated projects.

The Fernco QC-105 Flexible Qwik Cap offers a practical, removable sealing solution for 5" pipe terminations in non-pressurized applications. Its durable construction and multi-material compatibility make it a valuable fitting for temporary or serviceable line closures.