I have replaced the diaphragm to try to cure a persistent overflow (and hiss). It is still the same.
Could it be something sticking a bit as if I ripple the water it stops.
I don't want to have to remove the close fitted cistern to replace the valve as it isn't at my house.
Any suggestions?
I have fitted a new valve unitit with the diaphragm. It is still passing some water. I don't know if the problem is the main seating - or the small pilot valve and seating. I don't really understand it.
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