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White PVC flush cleanout plug with male threads

Mueller Industries, Inc.

Mueller Industries, Inc. 1WKT1 4 in MNPT PVC DWV Flush Cleanout Trap

SKU CH-70P9-2HXSM MPN 1WKT1

A 4-inch MNPT PVC DWV flush cleanout plug rated to 140 °F and built to ASTM D1784 cell class 12454 for Schedule 40 drainage systems

  • TypeDrain Components
  • ColorWhite
  • Schedule 40 PVC meets ASTM D1784 standards
  • 140 °F maximum temperature suits drain waste vent systems
  • MNPT thread allows direct connection to female fittings
  • White finish matches standard PVC piping
  • Cell class 12454 material resists corrosion in drainage use

4-inch PVC DWV Flush Cleanout Plug

This 4-inch PVC fitting provides a flush cleanout access point for drain, waste and vent systems. It connects via male NPT threads and is intended for non-pressure plumbing installations. The white Schedule 40 construction suits residential and light commercial drainage layouts.

Male NPT Threaded Connection

The fitting uses a 4-inch male NPT thread for direct engagement with a female-threaded adapter or pipe. This connection type determines compatibility with existing DWV piping. No solvent-weld socket is present, so the joint is made entirely by thread engagement.

Rated to 140 °F Maximum Temperature

The PVC material meets ASTM D1784 cell class 12454 and is rated for continuous service up to 140 degrees Fahrenheit. It is not rated for pressure applications, so sustained loads come from gravity drainage and thermal expansion rather than pressurised flow.

Highlights

  • Schedule 40 PVC meets ASTM D1784 standards
  • 140 °F maximum temperature suits drain waste vent systems
  • MNPT thread allows direct connection to female fittings
  • White finish matches standard PVC piping
  • Cell class 12454 material resists corrosion in drainage use

Specifications

TypeDrain Components
ColorWhite
BrandMueller Industries
Model1WKT1

Questions about this item

What does the 140-degree Fahrenheit temperature limit mean for a drain line?

The PVC material is rated for continuous use up to 140 degrees Fahrenheit, so it handles standard residential hot-water discharge but is not suited for high-temperature industrial waste lines.

How does the Schedule 40 rating affect what this fitting can handle?

Schedule 40 defines the wall thickness for drain, waste and vent service; this cleanout plug is designed for gravity-flow, non-pressure systems only and is not rated for pressure applications.

What do I need to connect this 4-inch MNPT cleanout plug?

It requires a female NPT threaded opening of matching 4-inch nominal size; the male pipe threads seal with thread sealant or tape when screwed into a compatible fitting.

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