Features Base is equipped with 3/4 inch and 1inch two-section screw-toothed conduits directly, with L-type bracket for flat mounting. The switch is sealed by the housing, completely moisture-proof, and it maintains precise performance and extends switch life Solid float ball is immersed in water, the center of gravity is stable, which does not float on the water surface, and it has high accuracy. Such a switch has two circuits of A.B. The A terminal is used for water supply and the B terminal is used for pumping water. Meanwhile, the double float ball water level switch has excellent performance and is easy to use. Specification:Item Type: Water level controller Pattern: 220V 7.5A AC Switch Life : 1 million times or more Water Channel Pressure: Equal to atmospheric pressure Temperature Range: 4°C ~ 80°C Principle: Using the principle of different weights when two float balls are immersed in water and in the air, the pump is automatically controlled to pump water or water according to the lifting of the water surface. Installation Method: 1. The optimal fixed position of the controller should be at the center of the top of the sink. If you want to fix it on the inner side of the sink, you should take care to avoid the float ball hitting the groove wall. 2. The hanging ball is attached to the controller wire, and the control range is from the center of the upper ball to the center of the lower ball, which can be freely adjusted as needed. Package List:1 x Controller Package List 1 x Controller