Gauge Adaptor For easy mounting of a pressure gauge onto a high pressure system The 3/8 in. NPTF male end connection screws into the pump or cylinder port, the 3/8 in. NPTF female end connection will accept hose or coupler and the 1/2 in. NPTF third port is for pressure gauge connection Hose Fittings & Accessories Components for use with the Enerpac range of high-pressure hydraulic equipment. All fittings and valves are 700 bar pressure-rated and have 3/8 - 18 NPTF threads.