Water hammer is usually recognized by a banging or thumping in water lines. The noise can occur when the flow of moving water is instantaneously stopped by a closing valve, or there are loose pipes in the wall, or there is a worn out washer on a faucet. The sudden stop of water, or a stutter caused by a loose or bad washer, results in a pressure spike behind the valve which acts like a tiny explosion inside the pipe. This pressure spike will create shock waves in the water that will reverberate throughout the plumbing system, rattling and shaking pipes, especially loose pipes, until it is...