To permanently cure a water hammer noise in your plumbing system, you must eliminate the hydraulic shock wave. Begin by installing piston-type mechanical water hammer arrestors as close as possible to fast-closing valves like washing machines and sinks. Second, secure all loose supply pipes firmly to structural framing using cushioned pipe straps to stop vibration. Third, check incoming water pressure with a gauge; if it exceeds 80 psi, install or adjust a pressure-reducing valve (PRV). Verification: Operate fast-closing fixtures to confirm all banging noises have stopped.
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