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White PVC male adapter with 4-inch hub and MNPT threads

Mueller Industries, Inc.

Mueller Industries, Inc. 1WKG8 4" Hub x MNPT PVC DWV trap

SKU CH-SF2T-G22YB MPN 1WKG8

A 4-inch PVC DWV male adapter with a hub-to-MNPT connection for drain, waste and vent piping

  • TypeDrain Components
  • ColorWhite
  • Schedule 40 PVC rated for 140 °F service
  • Hub by MNPT connection joins pipe to male threads
  • White finish matches standard DWV piping
  • ASTM D1784 cell class 12454 material compliance
  • Male adapter fits 4 in DWV systems

Product Identity

The Mueller Industries 1WKG8 is a 4-inch hub by male NPT PVC drain adapter built to Schedule 40 dimensions. It carries ASTM D1784 compliance and a cell class 12454 rating for material consistency. The white fitting is intended for non-pressure drainage, waste and vent systems. It is supplied new and ready for solvent-weld assembly.

Who It Suits

Installers joining a 4-inch hub socket to a male threaded pipe in residential or light-commercial DWV networks will find the fitting matches standard Schedule 40 sizing. The 140-degree Fahrenheit temperature ceiling and non-pressure rating exclude it from hot-water supply lines, pressurised systems or any application above that thermal limit.

Build Integration

The hub end accepts a 4-inch PVC pipe for solvent cementing while the male NPT thread mates with a matching female threaded fitting or valve. No gaskets, clamps or specialised tools are required beyond standard PVC primer and cement. The Schedule 40 wall thickness keeps the joint compatible with other Schedule 40 components in the same drainage stack.

Highlights

  • Schedule 40 PVC rated for 140 °F service
  • Hub by MNPT connection joins pipe to male threads
  • White finish matches standard DWV piping
  • ASTM D1784 cell class 12454 material compliance
  • Male adapter fits 4 in DWV systems

Specifications

TypeDrain Components
ColorWhite
BrandMueller Industries
Model1WKG8

Questions about this item

What size and schedule of PVC pipe do I need to connect to the 4-inch hub?

The hub accepts 4-inch Schedule 40 PVC pipe for a solvent-weld connection.

Can I thread this adapter into an existing female NPT fitting?

Yes, the MNPT end threads into any standard female NPT fitting of the same nominal size.

How can I verify the joint is sound after solvent welding and threading?

Pressure-test the DWV system per local code; the fitting is rated to 140 °F and meets ASTM D1784 cell class 12454.

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