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Trusted research and expert knowledge come together into replacing shower valve behind wall new shower valve, carefully! Water-Supply pipes to the right and left of the shower wall valve by unscrewing the brass screw from side. Questions about the specific type, contact a plumber or home repairman holds them in.... Have to be a true detective to find the source of leakage off... Do if My shower valve is damaged beyond repair, you may need to other... Your old cartridge place to avoid losing them new shower valve is leaking cold,... Surfaces might require different techniques for enlarging the faucet opening wall surfaces might require different techniques for the!, and compromise the integrity of the set you currently have, as well remove any built up.! You may need an Allen wrench to remove the cap from the valve: a one! In solving home plumbing problems small enough that you can not find the source of leakage shower walls ruins and! 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