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Round malleable iron pipe cap with female NPT threads

Anvil

Anvil 0318901329 trap malleable iron Class 3000 3/4 in NPT

SKU CH-WRB5-0QHQB MPN 0318901329

A malleable iron cap with 3/4 inch female NPT threads rated for 2,000 psi at 150 degrees F and 300 psi at 550 degrees F

  • TypeDrain Components
  • MaterialHAWA
  • Malleable iron construction handles 2,000 psi at 150 °F
  • Class 3000 rating supports 300 psi steam at 550 °F
  • Female NPT threads fit 3/4 in nominal pipe size
  • Operates from -20 °F to 550 °F without extra sealant
  • Solid plug design provides reliable drain closure

3/4 in NPT malleable iron cap

This Anvil 0318901329 cap is a Class 3000 malleable iron fitting with female NPT threads. It suits piping systems that require a solid plug construction at 3/4 in nominal pipe size. The component is intended for drain, waste or vent installations where a threaded closure is specified.

Pressure and temperature ratings

The cap withstands 2,000 psi at 150 degrees F maximum operating pressure and 300 psi at 550 degrees F maximum steam pressure. Service temperature spans from -20 degrees to 550 degrees F. These ratings cover normal hydraulic and low-pressure steam service without additional derating.

No sealant or gasket included

The fitting ships without pre-applied thread sealant and without an included seal. Installers must supply compatible pipe thread compound or tape to achieve a leak-tight joint. The solid plug design means no internal moving parts require maintenance.

Highlights

  • Malleable iron construction handles 2,000 psi at 150 °F
  • Class 3000 rating supports 300 psi steam at 550 °F
  • Female NPT threads fit 3/4 in nominal pipe size
  • Operates from -20 °F to 550 °F without extra sealant
  • Solid plug design provides reliable drain closure

Specifications

TypeDrain Components
MaterialHAWA
BrandAnvil
Model0318901329

Questions about this item

How do I install the 3/4 in NPT female threads on this malleable iron cap without cross-threading?

Start the cap by hand until the NPT threads engage smoothly for several turns, then tighten with a wrench; the taper seals as it seats, so forcing it early causes leaks.

Will the pre-applied thread sealant on this Class 3000 cap need replacement during service?

The cap ships without pre-applied sealant or an included seal, so you apply your own thread compound or tape at install and refresh it whenever the joint is broken for maintenance.

At what temperature does the 2,000 psi pressure rating of this 3/4 in malleable iron cap begin to drop?

The 2,000 psi rating holds at 150 degrees F; above that temperature the allowable pressure decreases toward the 300 psi steam limit at 550 degrees F.

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