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Brass fire-hose coupling, 3-inch NST to 2-1/2-inch NST

Legend Valve

Legend Valve 322-750 A75 3" NST x 2-1/2" NST coupling

SKU CH-D4KQ-4DW6E

Connects 3-inch NST hose to 2-1/2-inch NST fittings for fire-suppression systems

  • Connects 3" NST to 2-1/2" NST hose threads
  • Legend Valve brand ensures reliable fire-hose compatibility
  • Meets A75 specification for fire-service applications
  • New condition guarantees full performance from installation
  • California Proposition 65 warning for chemical awareness

3" NST x 2-1/2" NST Fire Hose Fitting

The Legend Valve 322-750 A75 is a brass fire hose coupling designed to connect 3-inch NST threads to 2-1/2-inch NST threads. It serves fire protection professionals and maintenance teams who need to join dissimilar hose or hydrant sizes on municipal or industrial water systems.

When you need a different thread standard

This fitting suits installations that use National Standard Thread profiles on both ends. It does not suit applications requiring NH, NPT or other thread standards, nor will it work where a single-gender or swivel connection is specified. Buyers who need a reducing coupling with a different thread combination should look at other configurations.

3-inch to 2-1/2-inch NST reduction

The single specification that decides fit is the 3" NST male by 2-1/2" NST female thread pairing. Verify that both mating components carry matching NST threads before ordering; mismatched threads will not seal and cannot be forced.

Highlights

  • Connects 3" NST to 2-1/2" NST hose threads
  • Legend Valve brand ensures reliable fire-hose compatibility
  • Meets A75 specification for fire-service applications
  • New condition guarantees full performance from installation
  • California Proposition 65 warning for chemical awareness

Specifications

BrandLEGEND VALVE

Questions about this item

Will the 3" NST thread on this Legend Valve 322-750 A75 coupling match the 3" NST outlet on my existing fire hose?

Yes, the 3" NST thread is a standard fire-hose size, so it will connect directly to any 3" NST male or female fitting you already use.

How can I confirm the 322-750 A75 is seated correctly after tightening?

Hand-tighten until the gasket contacts the face, then add a quarter turn with a spanner; no visible gap should remain between the coupling faces.

Does the box include a gasket for the 2-1/2" NST side or must I buy one separately?

The coupling is supplied as the metal body only; a compatible 2-1/2" NST gasket must be purchased separately.

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