I am not sure if they are available in England, for metric tubing, but the MINI-RESTER is the item which will solve the problem.: I am Looking for a supplier/Solution to solve regular : water hammer without reducing pressure at source. : I live in an typical English terrace property in : England.The water authority has replaced the old lead : pipe with blue plast wich now converts to standard 20mm : throught the house. : Any ideas/suppliers would be gratefully recieved :