Everflo EF4000 Diaphragm / Demand WATER TRANSFER PUMP 4.0 GPM 12V Volt 60 psi 4.0 GPM w/ 60 psi Demand Switch Viton Valves, Santoprene Diaphragm 1/2" NPT-Female Ports, Poly Housing Prewired with 2 Wire Molded Connectors Self Priming up to 8 Vertical Feet (2.4m)