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
Anvil 1/2 inch malleable iron pipe cap with FNPT threads

Anvil

Anvil 0318901303 1/2" malleable iron cap, Class 300, FNPT, 2000 psi at 150°F, 300 psi steam at 550°F

SKU CH-T1RZ-T83R9 MPN 0318901303

A 1/2" malleable iron pipe cap rated for 2000 psi at 150°F and 300 psi saturated steam at 550°F, meeting ASME B16.3 with FM and UL approvals

  • Product typeDrain Components
  • Main materialMalleable Iron
  • Rated 2000 psi at 150°F for high-pressure water systems
  • Handles 300 psi saturated steam at 550°F for demanding thermal applications
  • Malleable iron construction meets ASME B16.3 for proven dimensional reliability
  • FM Approved and UL Listed for verified safety compliance
  • AAR Approved for recognised rail-industry acceptance

1/2" Malleable Iron Cap, Class 300

This Anvil 0318901303 cap is a malleable iron pipe fitting designed for Class 300 service. It provides a threaded FNPT closure for 1/2 inch piping systems in plumbing and industrial applications.

AAR, FM, ASME B 16.3 and UL approvals

The fitting carries AAR and FM approvals, meets ASME B 16.3 and is UL Listed. These certifications confirm the cap meets recognised standards for pressure integrity and material quality in regulated installations.

2000 psi at 150°F, 300 psi saturated steam at 550°F

The cap is rated for 2000 psi at 150°F and 300 psi saturated steam at 550°F, with a temperature range from -20°F to 550°F. It is not suited for pressures or temperatures beyond these published limits.

How it compares

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

Price $13.99
Cheaper than about 76% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameAnvil
Model name0318901303
Product typeDrain Components
Size & build
Main materialMalleable Iron

Questions about this item

Will the 1/2" FNPT threads on this Class 300 malleable iron cap need re-taping or replacement after repeated make-up cycles?

The cap is manufactured to ASME B16.3 dimensions; threads should be inspected each time the joint is broken and fresh PTFE tape or pipe dope applied before re-assembly.

At 2000 psi and 150°F, what is the first limit reached — pressure rating or temperature rating?

The 2000 psi rating applies at 150°F; above that temperature the allowable working pressure drops per the ASME B16.3 pressure-temperature tables for Class 300 malleable iron.

Does the cap radiate noticeable heat or require insulation when carrying saturated steam at 300 psi and 550°F?

At 550°F the malleable iron body will be extremely hot; personnel protection insulation is recommended to prevent burns and to meet typical site safety codes.

More in Drain Stoppers, Strainers & Traps

Similar items