Step 1 · Diagnose and Locate the Problem Area

First, identify the source of the water hammer. The banging sound is caused by a shockwave when a valve closes quickly. Operate one fast-acting valve at a time, such as a washing machine, dishwasher, or a single-lever faucet, to pinpoint which line is causing the noise. The air chamber should be installed on the problematic supply line (hot or cold), as close as possible to the shutoff valve for that fixture.