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Galvanized malleable iron pipe cap, one inch FNPT, class 150

Anvil

Anvil 1124 Galvanized Malleable Iron Cap 1 in

SKU CH-1MXB-4N1GH

A 1-inch galvanised malleable iron pipe cap with FNPT threads, rated to 300 psi at 150 °F and 150 psi saturated steam at 350 °F

  • Galvanised malleable iron resists corrosion for long service life
  • Class 150 rating handles 300 psi at 150 °F water, oil or gas
  • FM Approved and UL Listed for code-compliant installations
  • Meets ASME B 16.3 and ASTM A197 standards for reliable performance
  • FNPT threads seal directly on 1 in pipe without extra adapters

Pipe Cap For 1 Inch FNPT Systems

This galvanized malleable iron cap terminates a 1 inch female NPT pipe fitting in Class 150 service. It is suited for water, oil, gas or saturated steam lines that require a pressure-tight seal. The fitting meets ASME B16.3 dimensions and carries FM and UL listings. Installers use it to close off unused ports or isolate sections during maintenance.

Replaces Damaged Or Missing Threaded Caps

The cap upgrades from worn brass or plastic plugs that can strip, crack or leak under thermal cycling. Malleable iron resists mechanical shock and thread deformation better than softer metals. The jump is worth it when the system sees 300 psi at 150 °F water, oil or gas, or 150 psi saturated steam at 350 °F. It also satisfies code requirements that mandate ASTM A197 listed components.

Handles Class 150 Pressure And Temperature Range

The fitting comfortably handles the full Class 150 rating of 300 psi WOG at 150 °F and 150 psi saturated steam at 350 °F. Continuous operation is rated from -20 °F to 350 °F. It runs out beyond the listed pressure-temperature envelope or in services that demand a higher schedule class. Galvanized coating provides corrosion resistance for standard plumbing environments.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 80% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameAnvil

Questions about this item

What thread size does the 1-inch FNPT cap need on the pipe?

The cap has a 1-inch FNPT connection that threads onto a matching 1-inch male NPT pipe end.

Which tool and sealing method are used to install the Class 150 malleable iron cap?

Use a pipe wrench on the cap flats and apply PTFE tape or pipe dope to the male threads before tightening.

What pressure and temperature limits determine when the galvanized cap should be replaced?

Rated 300 psi at 150 °F WOG and 150 psi saturated steam at 350 °F; replace if corrosion or leakage appears near those limits.

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