Seaflo Water Pressure Pump 12V DC 1.2 GPM 35 PSI 21 Series Diaphragm for Caravan RV Marine Fishing Boat The 21-Series Pumps are compact and designed for a wide range of applications including liquid transfer, spraying, circulation, filtration and dispensing The 21-series of diaphragm pumps are self-priming and can be run dry without harm. It provides up to 1.2 gallons per minute Built-in 35 PSI pressure switch for automatic stop/start Self-priming allows it to be mounted above tank; able to run dry 1.2 gallons per minute (4.2 liters per minute) Built-in thermal protector; 3/8-inch hose barb ports