The original diaphragm water pressure pumps. Highly reliable, belt driven pumps with built in pulsation dampeners and flexible mounts for noise and vibration reduction. All models can run dry. The 36950 gives 3 gpm (11.4 lpm). These Par water systems have been proven in thousands of installations and are standard equipment in many boats. A built-in check valve protects the pump against city water pressure. Ports are for 1/2" I.D. hose. In addition to fresh water systems these pumps can be used in salt water systems to provide deck wash-down, galley rinse water and anchor wash-down.