Step 1 · Identify the Source and Gather Materials

First, you must pinpoint the exact cause of the water hammer. Operate your home's water-using appliances one at a time. The noise will occur when the appliance's water valve closes quickly. The most common culprits are washing machines and dishwashers. Once you've identified the source (assumed to be the washing machine), gather the necessary tools and supplies. You will need a water hammer arrestor with a threaded connection and a push-to-connect tee fitting that matches the diameter of your copper pipe (typically 1/2 inch). Also gather your pipe cutter, deburring tool, and a marker.

Tools and Materials

Milwaukee 1/2 in. Close Quarters Tubing Cutter 48-22-4260Husky 1-5/8 in. Inner/Outer Reamer and Deburring Tool 410-248-0111FASTCAP Black Long Nose Pattern Marker FC.LNMWilkins 1/2 in. Copper Water Hammer Arrestor 1260XL-AQUICKFITTING 1/2 in. Push-to-Connect Brass Tee Fitting LF814R