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Round malleable iron pipe cap with female threads

Anvil

Anvil 0318900925 Malleable Iron Cap Class 150 Trap

SKU CH-F52S-XKJ6P MPN 0318900925

A malleable iron drain cap rated for 300 psi at 150°F and 150 psi at 350°F steam service

  • TypeDrain Components
  • MaterialHAWA
  • Malleable iron construction resists corrosion and mechanical stress
  • Class 150 rating handles 300 psi at 150 °F for reliable service
  • Withstands 150 psi steam pressure at 350 °F for high-temperature lines
  • Operates from -20 °F to 350 °F across diverse plumbing environments
  • Female NPT threads enable direct, leak-resistant pipe connections

Anvil Malleable Iron Cap 300 psi

The Anvil 0318900925 is a malleable iron drain cap built for plumbing systems that require Class 150 pressure ratings. It suits installers and maintenance crews who need a solid-plug fitting for female NPT connections. The component operates across a temperature range of -20 to 350 degrees Fahrenheit.

Class 150 rating with 300 psi maximum pressure

This cap is rated for 300 psi at 150 degrees F and 150 psi at 350 degrees F saturated steam. The Class 150 designation is the single specification that determines whether the fitting matches the piping schedule and design pressure of the installation. Verify the system pressure class before selecting this part.

No pre-applied sealant or gasket included

The fitting ships without pre-applied thread sealant and without an included seal, so the installer must supply compatible pipe thread compound or tape. This affects assembly time and the choice of sealing method for the specific fluid or gas service. Plan for the appropriate sealing material on site.

Highlights

  • Malleable iron construction resists corrosion and mechanical stress
  • Class 150 rating handles 300 psi at 150 °F for reliable service
  • Withstands 150 psi steam pressure at 350 °F for high-temperature lines
  • Operates from -20 °F to 350 °F across diverse plumbing environments
  • Female NPT threads enable direct, leak-resistant pipe connections

Specifications

TypeDrain Components
MaterialHAWA
BrandAnvil
Model0318900925

Questions about this item

What does the 300 psi rating mean when the cap is installed in a system?

The cap withstands up to 300 psi at 150 °F, so it will hold that pressure in water or air lines operating at or below that temperature.

How does the Female NPT thread limit what can be connected?

The internal NPT threads accept only male NPT fittings of the same nominal size, capping the joint to tapered pipe threads sealed with tape or compound.

What clearance is needed to fit the 3 1/2 inch nominal cap?

The round malleable iron cap matches a 3 1/2 inch nominal pipe, so the opening must accommodate that pipe size and allow a wrench on the hex for tightening.

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