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White PVC socket cap hub fitting with hub connection, 4 inch pipe size, Schedule 40

Mueller Industries, Inc.

Mueller Industries, Inc. 1WKK9 PVC Socket Cap Hub 4 in Trap

SKU CH-XGGF-BTDRS MPN 1WKK9

PVC socket cap hub with Schedule 40 rating for 4-inch drain connections, rated to 140°F and meeting ASTM D1784 cell class 12454

  • Product typeDrain Components
  • Product colorWhite
  • Schedule 40 PVC meets ASTM D1784 standards
  • Hub connection simplifies 4-inch pipe assembly
  • White PVC resists corrosion in drain systems
  • Rated to 140 °F for reliable service
  • Cell class 12454 ensures material quality

4-Inch PVC Socket Cap Hub

The Mueller Industries 1WKK9 is a white PVC socket cap hub designed for 4-inch pipe sizes in drain and trap assemblies. It suits plumbers and DIY installers who need to terminate a hub connection in non-pressure drainage systems.

Schedule 40 Drain Rating

This fitting meets ASTM D1784 cell class 12454 and carries a Schedule 40 classification for drain applications only. It is not rated for pressure service and has a maximum operating temperature of 140 degrees F.

Solvent-Weld Hub Installation

The hub connection installs with standard PVC solvent cement on clean, square-cut pipe. Common issues include applying cement to wet surfaces or forcing misaligned joints, which can cause leaks in the drainage line.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 86% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameMueller Industries
Model name1WKK9
Product typeDrain Components
Product colorWhite

Questions about this item

What does the 140 °F temperature rating mean for daily use?

The fitting is rated for continuous service up to 140 °F, so it handles typical residential hot-water lines without softening.

How does the Schedule 40 hub connection limit the joint?

The hub fits 4 in Schedule 40 PVC pipe and is not rated for pressure applications, so it is restricted to gravity-flow drain and vent systems.

What clearance is needed to install the 4 in hub cap?

The socket-depth hub slips over the outside of 4 in Schedule 40 pipe and requires enough straight pipe length to fully seat the cap.

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