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Galvanized malleable iron union coupling with FNPT threads

Anvil

Anvil 313822124 1" FNPT Galvanized Union Coupling

SKU CH-X7A2-DKPRT

A 1-inch FNPT galvanized malleable-iron union rated 300 psi at 150 °F and UL-listed to ASTM A197

  • Galvanized malleable iron resists corrosion for long service life
  • Class 150 rating handles 300 psi at 150 °F WOG
  • FM Approved and UL Listed for code-compliant installations
  • Meets ASME B16.36 and ASTM A197 standards for reliable performance
  • FNPT threads allow quick, leak-free assembly without welding

1" FNPT Galvanized Union Coupling

This Anvil union coupling joins two sections of 1-inch FNPT piping in residential, commercial or industrial systems. It is rated for 300 psi water, oil or gas at 150 °F and 150 psi saturated steam at 350 °F, with a service range from -20 °F to 350 °F. The fitting meets ASME B16.36, carries UL listing and FM approval, and is manufactured to ASTM A197 from galvanized malleable iron with 16-gauge cold-rolled steel components.

Installers needing a removable joint

Plumbers and maintenance technicians who require a serviceable connection for threaded steel or iron pipe will find this union practical. It is not suited for installations that demand a permanent welded or soldered joint, nor for systems operating above the stated pressure or temperature limits. Buyers working with copper, plastic or metric-threaded pipe should select a fitting designed for those materials.

Class 150 pressure rating

The single specification that determines suitability is the Class 150 rating combined with the 300 psi WOG and 150 psi steam limits. Verify that the system design pressure and temperature stay within these boundaries before specifying this union.

How it compares

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

Price $23.99
Pricier than about 60% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameANVIL

Questions about this item

Do I need 1 inch FNPT male threads on both pipes to install this union?

Yes, the union has 1 inch FNPT female threads on each end, so both connecting pipes or fittings must provide matching 1 inch male NPT threads for a proper seal.

Will this Class 150 galvanized union handle the same 300 psi water pressure as my existing Class 150 steel pipe at 150 °F?

The union is rated 300 psi WOG at 150 °F, matching Class 150 pressure limits, so it will handle the same water, oil or gas pressure as your existing Class 150 piping at that temperature.

How can I confirm the union is seated correctly after assembly?

Pressurise the system up to the 300 psi WOG rating and inspect the joint; no leakage at the union faces or threads indicates the ground-joint seat is properly made.

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