Description: There is a ball float valve inside which allows water to flow until a specific level is reached. Once the water has reached this level, the float valve will be pushed up by the water due to buoyancy and will stop the flow of water. When the water drops below the valve level, the float valve automatically fills your water tank, water tower, livestock and animal water drinker. Once it reaches the valve it will automatically stop filling so when the water reaches the internal float it will close. It is constructed of stainless steel material. There are different styles for you to choose. It's used for people to maintain the water level in a garden waterfall, on a yard fountain, for a rain gutter garden project, using it to make an automatic shut-off for swimming pools, for chicken coops, for automatic chicken water drinker, for cattle watering drought, for rain collection barrels in the outdoors etc. Item Name: Water Control Valve Material: Stainless Steel Features: Wide Application, Large Water Output, High Durability Size Details: A/B, Caliber: 2cm/0.79" (Approx.) C/D, Caliber: 2.5cm/0.98" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Water Control Valve 1 x PTFE Tape