We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • TypeDrain Components
  • 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.

Highlights

  • 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

Specifications

TypeDrain Components
ColorWhite
BrandMueller Industries
Model1WKK9

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.