... it at. Description:A float switch is a device used to sense the level of liquid within a tank. ... The switch may actuate a pump, an indicator ... pumps, ponds, basement alarms, boats, air condition drain pans, pressure washers, carpet cleaning mach., reef aquarium, fluid control, ice machines ... 107(DC 5V,10mA) FX-1AH-55-M16C Water Level Float Switch