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
Galvanized malleable iron union coupling with female NPT threads

Value Brand

Value Brand 1-1/2" FNPT Galvanized Union coupling

SKU CH-NM8K-RRX1K

Galvanised malleable-iron union with FNPT threads, rated 600 psi at 150 °F and compliant with ASME B16.39 and ASTM A197 standards

  • Galvanised malleable iron resists corrosion in water systems
  • FNPT threaded ends allow quick assembly without welding
  • Class 300 rating handles 600 psi at 150 °F WOG
  • Meets ASME B16.39 and ASTM A197 standards for reliability
  • California Proposition 65 warning applies — contains listed chemicals

Galvanized Malleable Iron Union

This 1-1/2 inch FNPT union connects threaded pipe sections in plumbing systems. The galvanized malleable iron body meets ASME B 16.39 and ASTM A197 standards for mechanical joints. It is suited for installers needing a serviceable connection point that can be disassembled without cutting pipe. Buyers requiring push-fit or compression connections cannot use this fitting.

Class 300 Pressure Rating

The fitting handles 600 psi at 150 degrees F water, oil or gas and 300 psi saturated steam. Galvanized coating resists corrosion in typical water supply environments. No moving parts or seals generate noise or consume power during operation. Systems exceeding the stated pressure or temperature limits need a higher-rated component.

Female NPT Threaded Ends

Both ends accept male NPT threads for standard pipe assembly. The union nut allows the joint to be broken for maintenance or equipment replacement without disturbing adjacent piping. Class 300 malleable iron construction provides mechanical strength for rigid installations. Installers without threading tools or working with non-threaded pipe must use a different coupling style.

Highlights

  • Galvanised malleable iron resists corrosion in water systems
  • FNPT threaded ends allow quick assembly without welding
  • Class 300 rating handles 600 psi at 150 °F WOG
  • Meets ASME B16.39 and ASTM A197 standards for reliability
  • California Proposition 65 warning applies — contains listed chemicals

Specifications

BrandZORO SELECT

Questions about this item

How do I install the 1-1/2" FNPT galvanized union and what step is often missed?

Thread each end onto the mating pipe using pipe sealant on the male threads, then tighten the central union nut to draw the faces together; the step often missed is lubricating the union nut threads so the joint seats fully without galling.

What maintenance or replacement will the galvanized malleable iron union need over time?

Inspect the zinc coating annually for white rust or pitting; replace the union if the coating is breached or if the ground-face seal shows leakage, as the malleable iron body itself is not serviceable.

What is the first pressure limit reached under sustained hot-water use at 150 °F?

The water-oil-gas rating of 600 psi at 150 °F is the governing limit; saturated steam service is capped at 300 psi, so hot water pressure must stay at or below 600 psi.

Also in this aisle

People compared these

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