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I think that's why they fitted 3 expansion valves. Do they do the same thing?? I will ask the plumber what he thinks about the arrestor too. Thanks so much. Don't know if it makes a difference, but the bang is when water turns on. Not off

We had a new Worcester boiler fitted. They installed a expansion valve with it ( globe shape object off a pipe under boiler) Then followed months of banging pipes when washing machine taps are put on. The boiler fitters did visit . Fitted new valve in toilet, 2 new showers, expansion valve by...