VEVOR Water Diaphragm Pump, 13.25 liters, 55 PSI Rated Pressure (40-80 PSI Adjustable), 12.7mm MNPT Self Priming Sprayer Pump with Pressure Switch for RV Camper Marine Boat Lawn, FCC Certified Overload Protection Switch with Ease Low Noise & High Quality The on demand water pump operates with a 3.5 GPM open flow, quickly boosting water pressure. No water supply problem will be a challenge for you. The rated pressure is set to 55 PSI, and you can adjust the pressure to 40-80 PSI. Turn clockwise to increase the pressure and vice versa to decrease it. The RV water pump comes with two 1/2" hose adapters for easy connection to the inlet and outlet. It works with a DC power supply, so there is no need to carry the battery. Max Liquid Temperature: 140/60,Number of Diaphragm Chambers: 4 PCS,Diaphragm Material: Santoprene,Max Flow Rate: 3.5 GPM,Granule Size: