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
Galvanised malleable iron union fitting with threaded ends

Value Brand

Value Brand Malleable Iron Union 1" NPT 5P960

SKU CH-A3K4-Z2ZTM

Malleable iron union joins two 1 in NPT threads at 150 class pressure rating

  • Malleable iron construction withstands demanding plumbing applications
  • Galvanized finish resists corrosion for longer service life
  • Class 150 pressure rating suits standard residential and commercial systems
  • 1 inch NPT threads connect directly to matching pipe sizes
  • California Proposition 65 warning informs safe handling practices

1-inch NPT Malleable Iron Union

The Value Brand 5P960 is a galvanized malleable iron union rated for Class 150 service. It connects two 1-inch female NPT threads with 11 threads per inch. The fitting suits water, oil or gas lines in residential and light commercial plumbing. It is not intended for high-pressure hydraulic systems or applications that require stainless steel corrosion resistance.

Sustained pressure and temperature performance

Class 150 rating defines the maximum working pressure at standard temperatures for this union. The malleable iron body resists mechanical shock better than cast iron but will corrode if the galvanized coating is damaged. California Proposition 65 warnings indicate the presence of chemicals linked to cancer and reproductive harm. The union is not designed for continuous cycling near its pressure limit or for potable water systems requiring lead-free certification.

Installation notes and common issues

Thread sealant or tape must be applied to the 1-inch NPT male threads before assembly to prevent leaks. Over-tightening can crack the malleable iron casting, especially in cold weather. The ground joint seat should be inspected for debris before final tightening. Misaligned piping places stress on the union nut and often causes weeping at the joint.

Highlights

  • Malleable iron construction withstands demanding plumbing applications
  • Galvanized finish resists corrosion for longer service life
  • Class 150 pressure rating suits standard residential and commercial systems
  • 1 inch NPT threads connect directly to matching pipe sizes
  • California Proposition 65 warning informs safe handling practices

Specifications

BrandZORO SELECT

Questions about this item

Does the galvanised Class 150 malleable iron union run hot or draw power when installed in a pressurised line?

The union is a passive mechanical fitting; it generates no heat and consumes no power during continuous operation.

What existing pipework must already be in place for the 1 in NPT threads to seal correctly?

Both sides require a matching 1 in NPT male thread — typically on steel, brass or copper pipe — plus thread sealant or tape rated for the system pressure.

Will the 11 1/2 threads per inch on this union mate with older NPT fittings already in the system?

Yes, 11 1/2 TPI is the standard pitch for 1 in NPT, so the union will engage with any compliant legacy NPT component.

Also in this aisle

People compared these

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