How to change the ball valve ballcock in your cold water storage tank in the loft.
Roof tank ballcock.
Make sure the water is turned off by taking off the lid of the cistern or tank and pushing down on the ballcock arm.
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.
On a roof tank you should find the tap on the top pipe.
Danco universal toilet tank repair kit 1 pack 80816 4 0 out of 5 stars 686 danco coast mark iv anti siphon ballcock toilet tank repair kit white black 1 pack 88915.
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.
They work by rising with the water level in the tank which in turn activates a lever which then shuts the valve.