These 5 GPM Bypass and Automatic Demand Pumps 12 VDC achieve a max of 5.3 gpm (20.1 lpm) and max of 90 psi (6.2 bar). Delivers 5.3 GPM (20.1 L/min) free flow Field-proven pump head design Driven by a 12-volt, Shurflo built sealed motor Self-priming capabilities, up to 8 feet (2.4 m) Chemical resistant, long-life diaphragm and valves Diaphragm: Santoprene Valves: Viton