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Its not the copper pipe that is vibrating, its a silver metal flexable pipe that goes from the overflow valve ti the vessel.
Hi . there really should be more clips on the incoming main cold , its pretty much in the air quite a bit .acceptable as long as the system has no issues , but that's not the case.. Could you just check the combined valve that the expansion vessel connects to for arrows and just confirm they are going in the right direction. Can you also check that the expansion vessel is not touching the pipework , thanks