Features Working Principle: The normal water intake process is started by the lower float switch, and the upper float switch stops working. Drainage is activated by the upper float switch and the lower float switch is deactivated. Application: The double float switch can be used to control the liquid level of water tanks, pools, water tanks, fish tanks, etc. (drainage or water), or as an alarm switch for liquid level up and down. Working Range: The action range of the two floats of the double float switch is 10mm. If the control range is large, the combination of two float switches can be used, so that there is a large stroke to ensure that the pump will not be started frequently. Note: The float switch cannot directly control the solenoid valve or high-power relay, AC contactor, etc., and needs a small relay (such as HH54P) for conversion. Durable: The float level switch is a liquid level control device with simple structure, no external power supply, no complicated circuit and easy to use. It has the advantages of smaller size and longer service life than mechanical switches. Specification: Voltage:DC 0~110V Material:304 Stainless Steel Size(Floating Body Length):(Optional) 100mm / 3.94in  150mm / 5.91in 200mm / 7.87in 250mm / 9.84in Package List: 1 x Double Ball Float Switch Package List