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White PVC reducing adapter with spigot and hub ends

Mueller Industries, Inc.

Mueller Industries, Inc. 1WKJ9 PVC Trap Adapter 4 in x 3 in

SKU CH-MYJN-ESH7N MPN 1WKJ9

PVC Schedule 40 reducing adapter joins 4 in hub to 3 in spigot for gravity drainage systems

  • TypeDrain Components
  • ColorWhite
  • PVC Schedule 40 rated for 140 °F maximum service temperature
  • Reducing design connects 4 in hub to 3 in spigot in one fitting
  • White finish matches standard DWV piping for clean appearance
  • Gravity-flow pressure rating suits residential drain, waste and vent systems
  • Operates reliably from -20 °F to 140 °F for year-round installations

4 in x 3 in PVC Hub Adapter

This PVC hub adapter connects a 4 in pipe to a 3 in pipe using a spigot by hub configuration. It is designed for gravity flow drainage systems in residential or commercial plumbing installations. The Schedule 40 construction provides standard wall thickness for typical drain waste and vent applications. Plumbers and contractors use it when transitioning between different pipe diameters.

White Schedule 40 PVC Construction

The white PVC material resists corrosion and chemical degradation common in drainage environments. Schedule 40 rating indicates the wall thickness suitable for standard gravity flow pressure requirements. The socket and spigot ends allow solvent weld connections without additional seal components. The adapter operates reliably between -20 degrees and 140 degrees Fahrenheit.

Reduces 4 in to 3 in Diameter

This fitting handles the transition from a 4 1/2 in outside diameter pipe down to a 3 1/2 in outside diameter pipe. The overall length measures 5 3/4 in, providing sufficient insertion depth for secure solvent welded joints. It suits gravity flow systems only and is not rated for pressurised applications beyond that scope. Builders needing larger reductions or pressure rated fittings must select different components.

Highlights

  • PVC Schedule 40 rated for 140 °F maximum service temperature
  • Reducing design connects 4 in hub to 3 in spigot in one fitting
  • White finish matches standard DWV piping for clean appearance
  • Gravity-flow pressure rating suits residential drain, waste and vent systems
  • Operates reliably from -20 °F to 140 °F for year-round installations

Specifications

TypeDrain Components
ColorWhite
BrandMueller Industries
Model1WKJ9

Questions about this item

Will the PVC material or the seal need replacement after years of drainage use?

The Schedule 40 PVC body resists corrosion and typical drain chemicals, so the adapter itself rarely needs replacement; only the separate seal may wear and require a new gasket over time.

What is the maximum operating pressure this adapter can handle during continuous flow?

It is rated for gravity flow only, meaning it handles the low head pressure of normal drainage but is not designed for pressurised or pumped systems.

How much heat can the fitting tolerate if hot water runs through it all day?

The PVC is rated from -20 degrees to 140 degrees F, so sustained hot-water discharge up to that temperature will not soften or deform the hub or spigot.

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