... A float switch is a device used to sense the level of liquid within a tank. The switch may actuate ... saltwater tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, pumps, ... Body Material:P.PLongevity:1 x 107(DC 5V,10mA)To install the float switch, please note ... inside of your applications tank. water float switch horizontal level for bilge pump