While water hammer typically occurs when a valve shuts off abruptly, hearing a knocking or banging noise when you open a tap can happen due to a few specific mechanical flaws. The most common cause is a loose washer or a deteriorated faucet stem valve core that vibrates violently inside the fixture as high-velocity water rushes past it. Additionally, unanchored supply pipes can jump and strike framing studs when initial water flow surges through the line. Verification: Rebuild or replace the faulty faucet cartridge and secure loose supply pipes.
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