[Easy to Use] Just one screwdriver is enough to quickly install the power cord and the sensing cord on the Water Level Controller. Water Supply and Drain ModeOpen is Water Supply Mode.Close is Drain Mode. Electric ball valve and electric solenoid valve just can be used for water supply mode. Pump can be used for water supply or drain mode. [220V] You can choose 220V solenoid valve, electric ball valve, water pump to work with the Controller. The load current of the Controller is 20A. [Stainless steel sensor with wire] Corrosive, non-rusting, suitable for long-term use. [Advantage] Features of low power consumption and long service life. [Application] This controller can help you realize the automatic feeding and drainage of fish ponds, reservoirs, swimming pools, water tanks.