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I should have asked: would a shock arrestor do anything in my case where the issue is with pressure in waste pipes?

Thanks for such a quick and thoughtful response, though I remain disappointed that you don't have any magical, simple solutions for me... Sink issues: there is, I'm told, another larger durgo which is indeed boxed in so that might be malfunctioning. Banging: b****cks. Cheers

Folks, I have two unrelated (i think) mysteries that are driving me mad and I’m looking for your help. 1) At night, in the winter, when we flush the toilet, empty the sink or bath in the bathroom, which is right next to our bedroom, there are bad pipe knocking sounds that appear to...