In this video, This Old House plumbing and heating contractor Richard Trethewey installs a laundry shut-off valve.
1. Close the existing shut-off valves that provide hot and cold water to the washing machine.
2. Use a wrench to disconnect both washing machine hoses from the valves; use a rag to catch any drips.
3. Tighten an adapter onto each of the hot- and cold-water shut-off valves.
4. Measure and cut plastic pipe to span from the adapters to the elbows on the automatic shut-off valve.
5. Assemble the plastic pipe and fittings using PVC primer and cement.
6. Thread an adapter onto the hot- and cold-water side of the automatic shut-off valve.
7. Hold the automatic shut-off valve in position against the wall, and mark the two mounting holes.
8. Drill holes on the marks and install hollow-wall anchors.
9. Screw the shut-off valve to the wall.
10. Reconnect the hot- and cold-water washing machine hoses. Then open the water shut-off valves.
11. Place leak sensor on floor and, then connect it to the automatic shut-off valve.
12. Plug washing machines power cord into the automatic shut-off valve, then plug the valve into the wall outlet.