Features: When the water level is below the for valve level, the float for valve automatically replenishes your water for tank, water tower, livestock, animal drinking for tank. Once the for valve is reached, it will automatically stop filling water, so it will close when the water reaches the internal float. The for valve replaces the traditional floating ball for valve, no electricity, easy to use, long life, low failure rate, saving water resources. Widely used in: water for tank, water tower, swimming pool, solar energy, toilet, hot water boiler, animal drinking water, air cooling, humidifier, civil buildings, cooling tower, hot water boiler, steamer, water for tank, water tower, toilet. Internal floating ball valves allow water to flow until a specific water level is reached. Once the water level reaches this level, the for valve is pushed up by the water due to buoyancy, stopping the flow of water. When the water level starts to drop, the for valve opens again and the water starts flowing again, so no electricity is needed. Used for water level maintenance of garden waterfall, garden fountain, rain for tank garden project, used for swimming pool, chicken house, automatic closing water fountain for raising chickens, cattle watering drought, outdoor rainwater collection bucket, etc. Package Includes: 1x Automatic Water for Valve Specifications: Material: Plastic+Rubber Size: As Shown Type: 6 Kinds Optional note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.