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Round malleable iron cap with female NPT threads

Anvil

Anvil 0318900842 Malleable Iron Cap Class 150 Trap

SKU CH-PS09-G4GF3 MPN 0318900842

A malleable iron cap rated for 300 psi at 150 degrees Fahrenheit and 150 psi at 350 degrees Fahrenheit steam pressure with female NPT threads

  • Product typeDrain Components
  • Main materialHAWA
  • Malleable iron construction resists corrosion and mechanical stress
  • Class 150 rating handles 300 psi at 150 °F water pressure
  • Female NPT threads accept standard 3 in pipe connections
  • Operates from -20 °F to 350 °F for steam and hot water systems
  • Solid plug design provides positive shut-off without separate seal

Anvil Malleable Iron Cap Class 150

The Anvil 0318900842 is a round malleable iron cap designed for drain components. It features a 3 in nominal pipe size with female NPT threading and a solid plug construction. The fitting is rated for 300 psi at 150 degrees F maximum operating pressure.

Suited for standard plumbing drain closures

This cap suits installers needing a Class 150 malleable iron fitting for drain lines. It is not for systems requiring included thread sealant or a pre-fitted seal. Buyers needing higher pressure classes or different material specifications should look elsewhere.

Pressure headroom up to 350 degrees F

The cap handles 150 psi at 350 degrees F maximum steam pressure within a -20 to 350 degrees F range. It runs out at pressures above 300 psi at 150 degrees F or steam duties above 150 psi. The solid construction provides reliable closure within these limits.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $37.99
Pricier than about 55% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameAnvil
Model name0318900842
Product typeDrain Components
Size & build
Main materialHAWA

Questions about this item

What pipe size and thread type does the 3 in cap require?

The cap fits a 3 in nominal pipe size with Female NPT threads.

Will the Class 150 rating handle my existing 300 psi steam line at 350 °F?

Maximum steam pressure is 150 psi at 350 °F, so a 300 psi steam line exceeds the rating.

How can I confirm the seal is holding after installation?

Pressurise the system to the operating pressure and check the joint for leaks.

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