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Little Giant's low level piggyback diaphragm switch converts any manual pump up to 1/3 HP (115V, 10 maximum running Amps) to automatic operation. Includes a 25-foot power cord. Designed to operate in water the compact design works well in limited space. The switch can be used either by attaching it to the Little Giant 5-MSP pump or attached to the discharge pipe of other pumps to control on-off operation of the pump. The switch is activated by pressure to a diaphragm, caused by rising water around the switch housing. The low level activates the pump when water reaches 2.5 inches and shuts the pump off when water falls to 1 inch (+/- 0.5 inches). This switch is ideal for use with utility pumps, hydroponic pumps or fountain pumps.