Ball float valves, also known as ballcocks are commonly found in water tanks, they control the flow of water into the tank and allow it to be filled to a certain level. The ball float rises with the water level in the tank and closes the valve to discontinue the water flow into the tank, they also prevent reverse flow and stop the tank from overflowing. If the water level drops the valve opens again allowing water to flow into the tank.
We offer brass and copper float valves from stock in sizes between 1/2" - 2", we also offer copper, stainless steel or plastic ball floats to suit each of the valves, these available in sizes between 4 1/2" - 12" as well as a range of metric sizing options.