Legend Valve 322-234 A91 2-1/2"NSTX2-1/2"NPT FXM PL coupling

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

This Legend Valve fitting connects a 2-1/2-inch NST thread to a 2-1/2-inch NPT thread in a female-by-male configuration. It is built for fire hose assemblies and water supply lines where these two thread standards meet. The component is supplied new and carries the manufacturer model reference 322-234 A91.

Installers joining NST and NPT threads

This coupling suits technicians who need a direct transition between National Standard Thread and National Pipe Thread on 2-1/2-inch hardware. It does not serve applications requiring a different thread size, a female-to-female or male-to-male orientation, or a non-fire-service pressure rating. Buyers needing other diameters or thread combinations should look at alternative fittings.

Simple thread engagement with sealant

Installation consists of applying appropriate pipe sealant or tape to the NPT male end and tightening both sides to the required torque. The most common issue is cross-threading when the NST and NPT pitches are misaligned during start-up, which damages the threads and prevents a leak-free seal. Clean threads and careful initial engagement avoid this problem.