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)