Integrated Switch Pumps Flexible impeller other models description features gallery 7.4 GPM Self-priming electric pump with flexible rubber impeller and a 3 positions switch to reverse the flow direction. Ideal for bilge and waste water on any type of boat. PART # VOLTS GPM PSI AMPERE PORTS M162-011-12 12 7.4 15 8A 1/2” BSP int. M162-011-13 24 7.4 15 4A 1/2” BSP int.