Water level switch is mainly used in equipments which request water level is regularly kept unchangeably. As a water level automatic control, it works when connected with implementation devices such as water pump or solenoid valve. Water level switch can be widely used in automobile, industry equipments, agriculture equipments and household electrical appliances such as ceiling air conditioner, solar water heater. Function Characteristics: when liquid level rises (or falls), swith will turn on/turn off. (Alternative)