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Galvanised malleable iron pipe union with tapered threads

Value Brand

Value Brand Malleable Iron Union 3/8 NPT Class 150 5P957

SKU CH-9XXX-JMY80

Malleable iron union connects 3/8 NPT pipes at Class 150 pressure rating

  • Malleable iron construction provides durable corrosion resistance
  • Class 150 rating handles standard plumbing pressure demands
  • 3/8 inch NPT threads ensure secure leak-free connections
  • Galvanised finish adds extra protection against rust
  • Union design allows easy pipe disassembly for maintenance

Union for 3/8 NPT piping systems

This malleable iron union connects two 3/8 inch NPT female threads in a piping system. It is rated for Class 150 service and suits general plumbing or industrial applications. The galvanised finish provides corrosion resistance for water, air or oil lines. Installers use it where a joint must be broken for maintenance without cutting pipe.

Class 150 pressure limit

The Class 150 rating defines the maximum working pressure at standard temperature for this fitting. Pressure capacity decreases as the operating temperature rises above ambient. The fitting is not suitable for high-pressure hydraulic circuits or steam service beyond the class limit. System designers must verify that the application stays within the published pressure-temperature envelope.

3/8 inch NPT thread size

The 3/8 inch NPT female threads on both ends are the single specification that determines compatibility. Mismatched thread size or standard will prevent a seal and risk leaks. This union will not join metric, BSPT or larger NPT threads without an adapter. Confirm the mating components share the exact 3/8 NPT specification before purchase.

How it compares

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

Price $6.99
Cheaper than about 78% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Which size and class of malleable iron union should I select for a 3/8 NPT connection?

This union is a 3/8 inch NPT female-to-female fitting rated Class 150, matching the listed specifications exactly.

What does the Class 150 rating mean for pressure handling in a real plumbing system?

Class 150 indicates the fitting is designed for standard-pressure service up to 150 psi in typical water, oil or gas lines.

How does the NPT thread standard affect sealing and compatibility with other fittings?

The 18 threads-per-inch NPT taper creates a mechanical seal when tightened, compatible with any 3/8 NPT male pipe or adapter.

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