2-1/2 in. (63.5 mm) Female NST x 2-1/2 in. (63.5 mm) Male NPT Brass Adapter secures to fire hose, hydrants, plumbing, piping, and pumps with one Female NST end and another Male NPT end. Machined from durable polished-brass, this adapter connects fittings of two different thread types for use with mismatched fire hose couplings, relay supply hose couplings, fire pump suction, fire hydrants, or nozzles.
These adapters include both National Standard Thread (made leak-proof with the included washer) and National Pipe Thread, and are especially useful when conducting mutual-aid operations in another city or county with different thread standards, and can be tightened or loosened easily using the hex-shaped wrench boss.