Shurflo 2088-313-145 Diaphragm Pump with Fin Cooled Motor (12VDC) Product Number: 2088-313-145. Poly Housing 12 Volt DC. 3.6 GPM open flow, Viton valves, Santoprene diaphragm, 45 PSI Demand Switch 1/2" MSPT ports (1/2" - 14 National American Straight Pipe Thread, requires SHURflo swivel type fittings).