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White PVC reducer trap with hub connections, 4 inch by 3 inch

Mueller Industries, Inc.

Mueller Industries, Inc. 1WKJ5 4 in x 3 in Hub PVC DWV Reducer Trap

SKU CH-H70Q-MNH6G MPN 1WKJ5

A Schedule 40 PVC drain fitting with hub connection reduces 4-inch to 3-inch pipe for DWV systems

  • TypeDrain Components
  • ColorWhite
  • PVC Schedule 40 resists corrosion and impact
  • Hub connection enables solvent-weld installation without threading
  • 4 in x 3 in hub reduces drain line diameter
  • ASTM D1784 cell class 12454 confirms material quality
  • Rated to 140 °F for standard DWV service

4 in x 3 in PVC DWV Reducer

This Mueller Industries reducer connects a four-inch hub to a three-inch pipe in drain waste and vent systems. It is made from white Schedule 40 PVC and meets ASTM D1784 cell class 12454. The fitting is not rated for pressure applications and has a maximum temperature limit of 140 degrees Fahrenheit. It suits plumbers and contractors working on standard gravity drainage installations.

Hub connection installs with solvent cement

The hub ends accept pipe that is solvent-welded using standard PVC primer and cement. A common issue is applying insufficient cement or failing to seat the pipe fully before the joint sets, which can create leaks. Because the fitting is not pressure-rated, it must only be used in non-pressurised DWV lines. Proper support and alignment during assembly prevent stress on the joint.

4 in x 3 in hub size determines compatibility

The reducer fits only where a four-inch hub must transition to a three-inch pipe in a Schedule 40 DWV system. It will not work for pressure piping, hot water supply lines, or applications exceeding 140 degrees Fahrenheit. Buyers needing a different size transition or a pressure-rated fitting must select another product.

Highlights

  • PVC Schedule 40 resists corrosion and impact
  • Hub connection enables solvent-weld installation without threading
  • 4 in x 3 in hub reduces drain line diameter
  • ASTM D1784 cell class 12454 confirms material quality
  • Rated to 140 °F for standard DWV service

Specifications

TypeDrain Components
ColorWhite
BrandMueller Industries
Model1WKJ5

Questions about this item

How can I confirm the reducer trap is seated correctly after installation?

After gluing the hub connections, run water through the line and check each joint for leaks; the white PVC should show no seepage at the 4 in x 3 in transition.

What comes in the box and what must I supply?

The package contains the single PVC reducer trap fitting; you must purchase Schedule 40 pipe, primer, and solvent cement separately to complete the hub connections.

Which fitting should I choose for a standard DWV line?

Select the 4 in x 3 in Schedule 40 hub reducer that meets ASTM D1784 cell class 12454 and is rated for 140 Degrees F maximum temperature.

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