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Cast iron reducing wye fitting, 3 by 4 inch female socket connections

Zoro Select

Zoro Select 221322 Reducing Wye Wye 3" x 4" Pipe Female Socket Cast Iron

SKU CH-CZ8Q-SMQBM

A reducing wye fitting connects 3-inch and 4-inch pipes with a female socket in cast iron

  • Reducing wye connects 3" and 4" pipes for drainage transitions
  • Female socket ends accept male pipe fittings without threading
  • Cast iron construction resists corrosion in waste-line installations
  • Zoro Select brand identifies the manufacturer of this fitting
  • First listed by the manufacturer in February 2024

Reducing Wye 3" x 4" Female Socket

This cast-iron reducing wye connects a 3-inch branch to a 4-inch main line using female socket ends. It is built for drainage, waste and vent systems where a directional change and size transition are required in a single fitting. Plumbers and contractors specify it for gravity-flow installations that demand durable, corrosion-resistant material.

Check Pipe Sizes And Joint Method Before Ordering

Verify that the existing main line measures 4 inches and the branch line measures 3 inches so the sockets fit without adapters. Confirm the system uses solvent-weld or gasketed socket joints compatible with cast-iron dimensions. Ensure the layout provides enough straight run for the wye angle and that local code permits cast-iron for the intended application.

Replaces Separate Reducer And Wye Combinations

Using this single fitting eliminates the need for a separate reducer coupled to a standard wye, reducing joint count and potential leak paths. The jump is worthwhile when space is tight, when fewer connections speed up assembly, or when the project specifies a one-piece cast-iron fitting for long-term reliability in below-grade or stack installations.

Highlights

  • Reducing wye connects 3" and 4" pipes for drainage transitions
  • Female socket ends accept male pipe fittings without threading
  • Cast iron construction resists corrosion in waste-line installations
  • Zoro Select brand identifies the manufacturer of this fitting
  • First listed by the manufacturer in February 2024

Specifications

BrandZORO SELECT

Questions about this item

Does the Zoro Select 221322 reducing wye include any gaskets or fasteners in the box?

The product is supplied as the cast iron fitting only; gaskets, bolts or other installation hardware must be purchased separately.

How do I confirm the 3" x 4" female socket dimensions match my existing pipe?

Measure the outside diameter of your current pipes — this wye accepts a 3 inch branch and a 4 inch run, both with female socket ends.

What does the 3" x 4" designation mean once the fitting is installed in a drainage system?

It indicates the branch connection is sized for 3 inch pipe and the main run for 4 inch pipe, allowing a reduction in flow direction.

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