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Flexible PVC cap for 4 inch pipe, model 104

Fernco Inc.

Fernco Inc. QC-104 Flexible Cap 4" Trap

SKU CH-487A-G52RE

A flexible PVC cap that seals 4-inch pipe ends, cleanouts, and test pipes with a tight, reusable fit

  • TypeDrain Components
  • MaterialFlexible PVC
  • Tight seals on test pipes with strong flexible PVC
  • Reusable cap installs quickly without special tools
  • Fits cast-iron steel plastic lead and copper pipe
  • Extra length simplifies elbow or tee replacement at joint
  • Ideal for tight in-wall or limited-space connections

Fernco QC-104 4-Inch Flexible Cap

This Fernco QC-104 flexible cap is a reusable plumbing component designed to seal 4-inch pipe ends, test pipes and cleanouts. It suits professional plumbers and maintenance teams needing a reliable, temporary or permanent closure during repairs or system alterations. The strong flexible PVC construction provides a tight fit on cast-iron, steel, plastic, lead and copper piping.

Slip-Type PVC Cap for Tight Installations

The slip-type design allows the cap to slide over the pipe exterior without threads or solvent cement, making it ideal for in-wall or confined-space connections where tool access is limited. Extra length on the cap body simplifies the replacement of elbows or tees that have been cut out at the joint. Flexible PVC material conforms to slight pipe irregularities to maintain a secure seal.

Replaces Threaded Plugs and Permanent Caps

This cap replaces threaded test plugs, glued-on caps or improvised seals that are slow to install and difficult to remove. The jump is worth it when a job demands repeated access for testing or inspection, or when working in restricted cavities where a wrench cannot reach. It is not for applications requiring a pressure-rated mechanical joint or a permanent structural connection.

Highlights

  • Tight seals on test pipes with strong flexible PVC
  • Reusable cap installs quickly without special tools
  • Fits cast-iron steel plastic lead and copper pipe
  • Extra length simplifies elbow or tee replacement at joint
  • Ideal for tight in-wall or limited-space connections

Specifications

TypeDrain Components
MaterialFlexible PVC
BrandFernco

Questions about this item

What pipe size does the 104 cap fit?

The 104 flexible cap is designed for a 4-inch pipe size and fits cast-iron, steel, plastic, lead, and copper piping.

How does the flexible PVC material handle heat during extended use?

The flexible PVC construction is intended for drain, waste, and vent applications and is not rated for continuous high-heat exposure.

Which existing pipe types are compatible with this slip-on cap?

This slip-type cap fits cast-iron, steel, plastic, lead, and copper pipe without requiring additional adapters or fittings.

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