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thanks guys for replying - i still have instructions but don't want to attempt adjusting valve myself (DH won't touch it either!), so guess plumber will have to make another visit. sorry, can't do pics at the moment, but it is mains pressure.

Hi, Plumber installed new fluidmaster float valve in toilet last week. flushes okbut every now and then it seems to do a mini flush which lasts about 6 seconds - i can hear the water 'hammering' in the pipes when it stops. Plumber came back, said nothing wrong with float valve, he thought...