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NigeF, Thanks for the suggestion, I have thought of that and discussed it with the plumber. Obviously it will help in reducing overall pressure but still won't stop the waterhammer, just make it less severe. cheers

Hi Rico, By similar I mean that the float is built into the stem as opposed onto an arm (lever forces and effect on closure speed etc) and that as far as I can tell from fluidmasters website it uses an instantaneous equilibrium valve closure versus a diaphragm valve which can close gradually...

Hi dennyboy, Thanks for that - it is however similar to the original filler provided with the cistern and again uses an equilibrium type valve that has instantaneous shut off which will cause surge/waterhammer. I've been in contact with opella and in line with another post on the forum...

Hi whitespirit66, thanks for the reply. The torbeck that bathstore sent me has a small upside down cup on an arm rather than a upside down cup in the filer stem as was supplied with the cistern. Both, as I understand are equilibrium types which have an instantaneous shut off. The...

I've just had the toilet replaced and the new (bathstore) cistern 6 litre came with a plastic bottom filling float arrangement. No waterhammer before, now with this new equilibrium type valve, a large nasty clunk when it shuts off. Bathstore technical very helpful and sent me a torbeck...