We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Round malleable iron pipe cap with female NPT threads

Anvil

Anvil 0318901345 1 in Malleable Iron Cap Class 3000

SKU CH-MNE6-8HGT3 MPN 0318901345

A 1-inch malleable iron pipe cap rated for 2,000 psi at 150 °F and 300 psi at 550 °F

  • TypeDrain Components
  • MaterialHAWA
  • 1 in Malleable Iron Cap rated for 3000 psi
  • Female NPT threads ensure secure pipe connection
  • Operates from -20 to 550 °F for wide temperature range
  • Handles 2000 psi at 150 °F maximum pressure
  • Rated 300 psi at 550 °F for steam service

1 in Malleable Iron Cap

The Anvil 0318901345 is a round malleable iron pipe cap with a 1 in nominal pipe size and female NPT threads. It is rated for Class 3000 service and suits plumbing systems that require a solid plug construction. Builders closing off a line on water, oil or gas piping will find the fitting matches the pressure class specified for the job. It is not for installers who need a cap with a pre-applied thread sealant or an integrated gasket seal.

Pressure and temperature envelope

The cap withstands 2 000 psi at 150 degrees F maximum operating pressure and 300 psi at 550 degrees F maximum steam pressure. Its continuous service range spans -20 degrees to 550 degrees F, so the fitting maintains integrity through both sub-zero starts and high-temperature steam cycles. The ratings reflect sustained load limits rather than short-term burst values. Systems that exceed either the pressure or the temperature ceiling will need a higher-class component.

Class 3000 rating decides fit

The single specification that determines whether this cap is the correct part is the Class 3000 designation paired with the 1 in nominal pipe size. If the piping schedule calls for a lower or higher class, or a different nominal size, this fitting will not meet the design requirements. Verify the class marking on the existing system before ordering.

Highlights

  • 1 in Malleable Iron Cap rated for 3000 psi
  • Female NPT threads ensure secure pipe connection
  • Operates from -20 to 550 °F for wide temperature range
  • Handles 2000 psi at 150 °F maximum pressure
  • Rated 300 psi at 550 °F for steam service

Specifications

TypeDrain Components
MaterialHAWA
BrandAnvil
Model0318901345

Questions about this item

How hot does the 1 in Malleable Iron Cap get when running at 2,000 psi and 150 Degrees F all day?

The cap is rated for continuous service up to 150 Degrees F at 2,000 psi and up to 550 Degrees F at 300 psi steam, so surface temperature will track the fluid temperature within those limits.

What pipe thread do I need on the mating fitting for this Female NPT cap to seal?

You need a male NPT thread of the same 1 in nominal size; the cap has Female NPT threads and no pre-applied sealant, so apply thread sealant or tape during assembly.

Will this Class 3000 cap handle the pressure spikes from my older steel piping system?

Yes, the Class 3000 rating gives a 2,000 psi maximum at 150 Degrees F and 300 psi steam at 550 Degrees F, well above typical older system pressures.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.