To reduce water pipe hammer, a banging noise in water pipes, shut off the incoming water to your home. Open the highest and lowest valves, often a bath valve and an outdoor hose bibb. Drain all water from these pipes, to restore air cushions in the plumbing system. Turn the incoming water back on. Open each faucet in the house, which may release air before water flows. T, this should eliminate or diminish the noise.
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