D
Darren
Any sudden stop in flow will resonate through a faulty valve. I would be ruling out each toilet fill valve one by one, do you have isolators fitted at each toilet? If so turn them all off and try to replicate the clunk. Do you have a combi or gravity hot water system?
Hi yes I have isolators at each toilet and washing machine, dishwasher and outside tap, noise is always in same place somewhere under floor or in wall. If I open a tap a little at the same time as flushing no noise? I have a ho****er tank that is my thermal store for heating, my hot water is mains pressure heated via coil as it passes through thermal store.