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Galvanised malleable iron union coupling, 3/8 inch FNPT, Class 150, silver-grey finish

Anvil

Anvil 313822041 3/8" FNPT galvanised union coupling

SKU CH-R3PE-GKPS4

Galvanised malleable-iron union with 3/8" FNPT threads, Class 150 rated to 300 psi at 150 °F and 150 psi saturated steam at 350 °F, meeting ASTM A197, ASME B16.36, FM and UL approvals

  • Galvanised malleable iron resists corrosion in water systems
  • Class 150 rating handles 300 psi at 150 °F WOG
  • FM approved and UL listed for code-compliant installations
  • Meets ASME B16.36 standard for reliable joint integrity
  • Operates from −20 °F to 350 °F including 150 psi saturated steam

Anvil 3/8" FNPT Galvanised Union

This Anvil union coupling joins two sections of 3/8-inch FNPT pipe using galvanised malleable iron rated to Class 150. It suits plumbing and low-pressure steam systems that require a detachable joint without cutting pipe.

Tool-free union nut simplifies assembly

The ground-joint design lets installers tighten the union nut by hand then snug with a wrench, avoiding solder or adhesive. Misaligned threads or overtightening the nut can damage the seating face and cause leaks under pressure.

Handles 300 psi water, oil, gas at 150 °F

The coupling withstands saturated steam at 150 psi and 350 °F across a -20 °F to 350 °F range. It is not intended for pressures above the Class 150 rating or for pipe sizes other than 3/8 inch.

How it compares

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

Price $15.99
Cheaper than about 55% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameANVIL

Questions about this item

How can I confirm the union is sealing correctly after installation?

Pressurise the line up to 300 psi at 150 °F water-oil-gas or 150 psi saturated steam at 350 °F; no visible leaks at the FNPT threads or the union joint means it is working as intended

What comes with the coupling and what must I supply?

The box contains the galvanised malleable-iron union coupling only; you must provide 3/8" FNPT pipe nipples, thread sealant or tape, and appropriate wrenches

Which specification should I match when selecting this union?

Choose this 313822041 model when your system requires Class 150 malleable iron, 3/8" FNPT ends, ASTM A197 material, and compliance with ASME B 16.36, FM and UL listings

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