A knocking noise in a water pipe that occurs when a tap is turned off briskly.
- The sprinkler's closed-case design protects internal parts from debris contamination, while a steady piston valve guards against water hammer, pressure spikes and damage to the overall system.
- If eliminating water hammer from an older house, locating the offending valve or faucet and installing a water arrester at that location is one solution.
- Since installation I have had water hammer when the pump shuts off.
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Syllabification: wa·ter ham·mer
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