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Malleable iron union coupling, 1-1/4 inch FNPT, Class 150 finish

Value Brand

Value Brand 5P594 Union 1-1/4" FNPT Malleable Iron Class 150 coupling

SKU CH-X55F-DA8GY

Malleable iron Class 150 union joins two 1-1/4 inch FNPT pipes securely

  • Malleable iron construction provides Class 150 pressure rating
  • Female NPT threads on both ends accept 11-1/2 threads per inch
  • Union design allows quick pipe disassembly without cutting
  • 1-1/4 inch pipe size fits standard plumbing applications
  • New Zoro Select fitting ships ready for installation

Union Connection

This malleable iron union provides a removable joint for 1-1/4 inch NPT piping systems. The female threaded ends allow direct assembly onto male pipe threads without welding. It suits installers who need a connection that can be broken for maintenance or equipment replacement.

Class 150 Pressure Rating

Rated for Class 150 service, the fitting handles typical low-pressure water, air and oil lines within its design limits. Malleable iron construction resists cracking under vibration and thermal cycling better than cast iron. The joint maintains sealing integrity through repeated make-and-break cycles when installed with proper thread sealant.

NPT Thread Compatibility

Both ends use 1-1/4 inch Female NPT threads at 11-1/2 threads per inch for standard North American pipe compatibility. The taper-thread design creates a mechanical seal when tightened to specification. Systems requiring metric, BSPT or flanged connections cannot use this fitting without adapters.

How it compares

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

Price $11.99
Cheaper than about 65% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Does the 150 class malleable iron coupling generate heat or noise when used continuously in a plumbing system?

The malleable iron Class 150 union is a passive fitting with no moving parts, so it produces no noise or heat during continuous operation.

What pipe size and thread type must I already have to install this 1-1/4 inch FNPT union?

You need 1-1/4 inch pipe with female NPT threads at 11-1/2 threads per inch on both ends to connect this union.

Will this 1-1/4 inch NPT union thread onto older iron or steel pipe with the same nominal size?

Yes, the female NPT threads at 11-1/2 TPI match the standard taper used on older iron and steel pipe of the same nominal size.

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