Shop Nilight RV Water Pressure Regulator for RV Camper, Water Hose Pressure Regulator with Oil Filled Gauge and Inlet, Brass Lead-free Adjustable RV Water Pressure Regulator Valve for Camper Travel Trailer in high quality. keep the outlet side opening and just swith the knob counterclockwise to set pressure lower, then close the outlet side to observe the pressure, if the pressure is still higher than you need, repeat the above steps to reduce the pressure until you get the pressure you want.