Jabsco Par-Max 1 Miniature Automatic Demand Pump The new Par-Max 1 compact automatic demand water system is self-priming to 4 feet, and can run dry for extended periods of time without harm to the pump. This little workhorse can supply three fixtures, one or two in use at a time. The built-in pressure switch automatically starts and stops the pump when the faucet is opened or closed. The Par-Max 1 motor is thermally protected 12 Volt DC, 1.9 Amp. (@ 10 psi) Flow: 1.1 GPM 3/8" hose barb ports Pressure switch on at 22 psi, off at 35 psi. Two adapters for 3/8" barb to 1/2" hose Dimensions: 2.3"H x 3.5" W x 6.3"L