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Brass fire hose coupling with NPT and NST threads

Legend Valve

Legend Valve 322-611 A93 1-1/2" NPT x 1-1/2" NST coupling

SKU CH-3K2J-EEH6G

Connects 1-1/2 inch NPT pipe threads to 1-1/2 inch NST fire hose threads

  • Connects NPT threads to NST fire hose threads
  • 1-1/2 inch NPT male by 1-1/2 inch NST female
  • Legend Valve brand fitting for fire protection systems
  • Model 322-611 A93 identifies exact thread configuration
  • California Prop 65 warning applies to this product

1-1/2" NPT to NST Fire Hose Coupling

This brass coupling connects 1-1/2 inch NPT pipe threads to 1-1/2 inch NST fire hose threads. It is designed for fire protection systems, industrial water lines, and municipal hydrant connections. The fitting meets the dimensional requirements for standard fire department equipment. Installers use it to adapt rigid piping to flexible fire hose assemblies.

Threaded Brass Construction and Seal Integrity

The all-brass body resists corrosion in wet environments and withstands typical municipal water pressure. Tapered NPT threads create a mechanical seal when tightened with appropriate sealant. The straight NST threads rely on a gasket seat for a leak-free connection. No moving parts or internal components require lubrication or periodic adjustment.

Adapts Rigid Pipe to Fire Hose Threads

This coupling replaces makeshift reducer bushings or mismatched thread adapters that compromise flow or sealing. The jump is worth it when a secure, code-compliant transition between NPT piping and NST hose couplings is required. It is not suited for systems using British Standard Pipe threads or metric fire hose connections.

Highlights

  • Connects NPT threads to NST fire hose threads
  • 1-1/2 inch NPT male by 1-1/2 inch NST female
  • Legend Valve brand fitting for fire protection systems
  • Model 322-611 A93 identifies exact thread configuration
  • California Prop 65 warning applies to this product

Specifications

BrandLEGEND VALVE

Questions about this item

How do I install the 1-1/2" NPT threads without cross-threading?

Clean both thread sets, apply PTFE tape or pipe dope to the NPT side only, start by hand for at least three full turns before using a wrench, and stop when resistance increases sharply — that is the taper seat engaging.

What maintenance will the NST coupling need over time?

Inspect the gasket each season; replace it if it shows cracks, flattening or hardening, and lubricate the swivel threads with silicone grease to keep the connection turning freely.

What limit appears first under sustained pressure on this fitting?

The brass body will reach its pressure rating before the threads strip, so sustained use at or above the rated working pressure risks permanent deformation of the coupling.

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