The most prominent signs of water hammer include loud banging, knocking, or thudding noises echoing through walls and floors immediately after a faucet, toilet, or appliance shuts off. Other indicators include visible pipe shaking or vibration when valves close, and in severe cases, premature weeping or leaking at pipe joints due to ongoing mechanical fatigue caused by high-velocity hydraulic shock waves. Verification: Listen closely near washing machines and sink valves to pinpoint where the knocking originates.
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