Cavagna (91-1-490-1127B 30 PSI Single-Stage High Pressure Regulator Cavagna Single-Stage 30 PSI High Pressure Regulator High Pressure 30 PSI regulator Inlet: 1/4 inch Female Pipe Thread, Outlet: 1/4 inch Female Pipe Thread For use on applications that require pounds per square inch (PSI) of pressure instead of low pressure water column inches