I have a Fluid Master 747 Side entry valve fitted to my WC cistern. When the cistern is filling, water leaks from the top of the valve. I have cleaned the valve and removed debris from the flow restrictor and fitted a new rubber diaphragm washer - but water still leaks from the top and you can hear it dripping as the cistern fills. Once the cistern is full and the valve cuts off the leakage stops.
Can anyone tell me why it should it leak and how I can prevent it?
Can anyone tell me why it should it leak and how I can prevent it?