Ballcocks also known as float valves are found in water tanks and are used to control the flow of water into the tank.
Roof tank ballcock.
This part is often known by the generic term ballcock although strictly speaking a ballcock is an older form of this valve that is rarely installed anymore.
One of the most common toilet repairs is adjusting or replacing the fixture s fill valve.
Before you go any further check that there is no water in the ballcock float.
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There should be no water gushing out.
How to change the ball valve ballcock in your cold water storage tank in the loft.
They work by rising with the water level in the tank which in turn activates a lever which then shuts the valve.