The Float Switch Cannot Directly Control Solenoid Valves Or High-Power Relays, Ac Contactors, Etc. A Small Relay (Like Hh54P) Is Needed For The Transition.The Double Float Switch Can Be Used To Control The Liquid Level Of Water Tank, Swimming Pool, Sink, Fish Tank, Etc (Drain Or Water), Or To Make The Upper And Lower Alarm Switch Of The Liquid Level.The Contacts Inside Are Made Of A Very High Sensitivity Reed Switch.The Range Of D Action Of The Two Floats Of The Double Float Switch Is 10 Mm. If The Demand Control Range Is Large, Two Float Switch Combinations Can Be Used, So That There Is A Large Stroke To Ensure That The Pump Does Not Start Frequently.Normal Intake Process Water Activated By The Float Switch Below, And The Float Switch Above Stops Working. The Drain Is Activated By The Float Switch Above And The Float Switch Below Stops Working.