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
3/4 inch galvanized malleable iron union with FNPT threads

Value Brand

Value Brand 3/4" FNPT Galvanized Union Class 300

SKU CH-B2Q5-VHEEG

A 3/4-inch FNPT galvanized malleable iron union rated Class 300 for 600 psi at 150 degrees F WOG and 300 psi saturated steam, meeting ASME B16.39 and ASTM A197 standards

  • Rated for 600 psi water, oil, gas at 150°F
  • Handles 300 psi saturated steam service
  • Galvanized malleable iron resists corrosion
  • Meets ASME B16.39 and ASTM A197 standards
  • 3/4 inch FNPT threads for secure pipe connections

Galvanised Malleable Iron Union

This 3/4 inch FNPT union is made from galvanised malleable iron to ASME B16.39 and ASTM A197. It provides a detachable joint for threaded pipework in plumbing and industrial systems. The Class 300 rating suits demanding water, oil and gas applications.

Pressure Capacity And Limits

Rated for 600 psi at 150 degrees Fahrenheit WOG, it handles high-pressure fluid lines with a safety margin. Saturated steam service is limited to 300 psi, so steam systems must stay below this threshold. Exceeding either pressure or temperature rating risks joint failure.

Threaded Connection Constraints

The FNPT taper threads seal with pipe compound or tape but require careful alignment to avoid cross-threading. Galvanised coating resists corrosion yet can flake if over-tightened, compromising the seal. Installers must observe the 300 psi steam ceiling and 600 psi WOG ceiling for code compliance.

Highlights

  • Rated for 600 psi water, oil, gas at 150°F
  • Handles 300 psi saturated steam service
  • Galvanized malleable iron resists corrosion
  • Meets ASME B16.39 and ASTM A197 standards
  • 3/4 inch FNPT threads for secure pipe connections

Specifications

BrandZORO SELECT

Questions about this item

Will the 3/4" FNPT threads on this galvanized union match the ASME B 16.39 standard used on my existing pipework?

Yes, the fitting is manufactured to ASME B 16.39 so the 3/4 inch FNPT threads will match pipework built to the same standard.

How can I verify the union is holding pressure correctly after installation?

Pressurise the system up to the 600 psi WOG rating at 150 °F and check for leaks at the joint; the Class 300 rating also covers 300 psi saturated steam.

Does the box include any gaskets or thread sealant, or must I buy them separately?

The union is supplied as a single galvanised malleable iron fitting to ASTM A197; gaskets and thread sealant are not included and must be purchased separately.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.