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The shock wave originates from my neighbours house and then travels into our house. This is where I would place the arrestor. The water flows in the direction of the arrows: neighbours house<--shared mains-->our stop tap-->arrestor-->loose pipes

Thanks for your reply. I believe we have a shared water supply with the neighbours. The arrestor would be fitted just after where the water supply enters our house. The loose pipes would be after the arrestor. The pipes are un-accessible without ripping walls open. I am not bothered about...

I have a problem with water hammer. I know where the knocking is coming from but the pipes are not accessible. I could live with it if it was just knocking when we turned taps off etc. but it knocks when the neighbours are using their washing machines and taps. I have turned the water...