This Little Giant Piggyback Diaphragm Switch converts any manual pump, up through 1/3 HP (10 max. run amps), to automatic. When mounted to 5-MSP pump, "on" level range is 2"-3", (5.1cm - 7.6cm) "off" level range is 1/2" - 1-1/2" (1.2 cm-3.8 cm).18' cord