Usage Tips:ABS+stainless steel water level control valve: The water level control valve is made of food grade plastic for drinking water pipes and 304 stainless steel screws, rustproof, corrosion resistant and longer life.-No electricity required: Water level control valve replaces traditional float valves and does not require electricity. It is easy to use, has a long life, low failure rate and saves water resources.-Easy installation: The float valve is small and easy to install. It has an estimated water volume rate of up to 40 psi and 3 gallons per minute.-Working principle: When the water level rises to limited water line, the water level control valve immediately stops the water supply; when the water level drops, the valve starts to supply water automatically.