Automatic water level control valve - Fully automatic built-in float valve for easy installation. Its compact size fits in tight spaces and it operates with a supply pressure up to 40 psi and a flow rate up to 3 gallons per minute. - No power required. Unlike traditional float valves, this valve needs no electricity to operate, offering simple operation, long service life, low failure rate, and a resource-efficient design. - Environmentally friendly. The safe, non-emitting design releases no harmful substances during operation, supporting a healthier and safer environment. - Wide range of applications. Suitable for tanks, towers, pools, solar energy systems, animal drinking water, air cooling, humidifiers, civil buildings, cooling towers, steam generators, and general tanks and towers. Use scenarios - Maintain water level in solar storage tanks or other non-energized water systems, reducing wiring needs and energy use. - Provide reliable water for livestock troughs or wildlife drinking lines in locations without power. - Make-up water control for cooling towers or steam generators to ensure proper levels with minimal maintenance.