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Small galvanized malleable iron pipe union with female threaded ends, silver-grey finish

Anvil

Anvil 1/4" FNPT Galvanized Union Class 150

SKU CH-S0NR-HM6ZN

Galvanized malleable iron union with FNPT threads rated 300 psi at 150 °F WOG and 150 psi saturated steam at 350 °F

  • Galvanized malleable iron resists corrosion for long service life
  • Class 150 rating handles 300 psi at 150 °F water, oil, gas
  • FM approved and UL listed for code-compliant installations
  • Meets ASME B 16.36 standard for reliable threaded joints
  • Operates from -20 °F to 350 °F including 150 psi saturated steam

Anvil 1/4" FNPT Galvanized Union

This Anvil union connects two pipes with 1/4 inch female national pipe threads. It is made from galvanized malleable iron for corrosion resistance in plumbing systems. The Class 150 fitting suits residential and light commercial water, oil or gas lines. Installers needing a detachable joint on small-bore piping will use this part.

Installation uses standard pipe wrenches

Apply thread sealant to the FNPT ends before tightening to prevent leaks. The ground-joint seat seals metal-to-metal without a gasket, so clean threads are essential. Over-tightening can crack the malleable iron body, especially in cold weather near the minus 20 degrees Fahrenheit lower limit. Ensure pipe alignment to avoid stress on the joint.

Rated 300 psi at 150 degrees Fahrenheit WOG

This pressure-temperature rating is the decisive figure for selecting the union. It also handles saturated steam at 150 psi and 350 degrees Fahrenheit. The fitting meets ASME B16.36, ASTM A197, FM and UL standards. Systems operating above these limits require a higher-class fitting not supplied here.

How it compares

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

Price $20.99
Pricier 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 threading it onto 1/4" FNPT pipe?

Pressurise the line up to 300 psi at 150 °F WOG or 150 psi saturated steam at 350 °F; no leakage at the joint confirms a proper seal.

What components are included and what must I supply separately?

The box contains the galvanized malleable iron union only; you must provide 1/4" NPT pipe, thread sealant or tape, and appropriate wrenches.

Which class rating should I select for a 300 psi water-oil-gas system at 150 °F?

Choose the Class 150 version listed — it is rated for 300 psi @ 150 °F WOG and meets ASME B16.36, ASTM A197, FM and UL requirements.

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