These are versatile test pumps for a high flow rate and speed of test. They use water as the media and a gasoline pump to test one line of a wide range of hose sizes (ie. up to 18" ID or more). Inlet 1" Female NH/NST, outlet 1/2" Male NPT. Refer to our Fire Adapters Section D to get to BAT, NPSH, NPT, and other inlet or outlet threads (N9604- series).