Float Switch: Switching Device That Activates Or Deactivates When The Liquid Is Rising Or Sinking. Cable And Weight Included. A Float Switch Is A Device Used As A Level Gauge And Detects The Level Of Liquied In A Tank Or Enclosure. A Float Switch Opens Or Closes An Electrical Circuit To Control The Flow Of An Electrical Current To A Connected Device As A Pump Or Valve. For Controlling Pump Or Valve To Allow Water In Or Out As Required By The Respective Application. 10M Cable.