Integrated Switch Pumps Bronze Gears other models description features gallery Self-priming electric pump with bronze gears and a 3 positions switch to reverse the flow direction. For oil and viscous liquids transferring. PART # VOLTS GPM tube Ø 1/2" AMPERE PORTS M164-022-12 12 1.5 6A 3/8” NPT M164-022-13 24 1.5 3A 3/8” NPT