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The most common size and threads for US fire hydrants is 4 1/2 inch NH / NST
They have specialized in municipal fire fighting
Female red dry hydrant adapter with aluminum NH/NST plug
Plug meets or exceeds NFPA requirements
Aluminum 4" Male Camlock x 4" Male NPT Threads_NH x NPSH The most common size andGlobal type "F" aluminum 4 inch male camlock (Cam & Groove) coupler to 4 inch male NPT threads. Under no circumstances should cam and groove couplings be used for compressed air or steam service! Connections The male side of this adapter will only connect to 4 inch female camlock The male threaded side of this adapter will only connect to a 4 inch female National Pipe Tapered (NPT) or a National Pipe Straight Hose (NPSH) thread, for example, PVC or