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Round malleable iron pipe cap with female NPT threads

Anvil

Anvil 0318901428 Malleable Iron Cap Class 3000 trap

SKU CH-6BR0-FSXN6 MPN 0318901428

A 3-inch malleable iron cap rated Class 3000 for 2,000 psi at 150 °F and 300 psi steam at 550 °F

  • Product typeDrain Components
  • Main materialHAWA
  • Malleable iron construction withstands 2,000 psi at 150 °F
  • Class 3000 rating supports 300 psi steam pressure at 550 °F
  • Female NPT threads enable direct pipe connection without adapters
  • Solid plug design blocks flow completely for reliable isolation
  • Operating range from -20 °F to 550 °F suits hot and cold systems

Anvil Malleable Iron Cap 3 in NPT

The Anvil 0318901428 is a Class 3000 malleable iron cap with a 3 in nominal pipe size and Female NPT threads. It is built for plumbing systems that require a solid plug construction to seal pipe ends. The fitting suits installers who need a pressure-rated component for water, oil or gas lines within the stated temperature range. It is not for buyers who want a cap with pre-applied thread sealant or an included gasket seal.

Threaded installation no sealant included

The cap threads onto a male NPT fitting using standard pipe-thread practice. Because the product ships without pre-applied thread sealant or an included seal, the installer must supply compatible tape or compound. The solid plug construction means there is no internal cavity to trap debris, but the missing sealant raises the risk of leaks if the joint is not prepared correctly. Overtightening malleable iron can crack the casting, so a calibrated approach is advised.

Pressure and temperature limits under load

The cap is rated for 2,000 psi at 150 Degrees F maximum operating pressure and 300 psi at 550 Degrees F maximum steam pressure. The service temperature spans -20 Degrees to 550 Degrees F, so the fitting maintains integrity through thermal cycling. Under sustained steam or high-pressure water service the malleable iron body resists deformation within these published limits. It is not for systems that exceed the Class 3000 pressure class or operate outside the documented temperature envelope.

How it compares

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

Price $112.99
Pricier than about 80% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameAnvil
Model name0318901428
Product typeDrain Components
Size & build
Main materialHAWA

Questions about this item

How can I confirm the Anvil 0318901428 cap is sealing correctly after installation?

Pressurise the system up to 2,000 psi at 150 °F or 300 psi steam at 550 °F and check for leaks at the Female NPT threads; the solid plug construction should hold pressure without weeping.

What comes with the Anvil 0318901428 and what must I supply?

The box contains the 3-inch malleable iron Class 3000 round cap only; you must provide pipe thread sealant and any mating pipe or fitting separately.

Which Anvil cap version matches a 3-inch Class 3000 Female NPT requirement?

Choose model 0318901428 — it is the 3-inch nominal pipe size, malleable iron, Class 3000 cap with Female NPT threads rated for the stated pressure and temperature limits.

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