• In this video, This Old House plumbing and heating expert Richard Trethewey replaces a three-handle shower valve with a single-handle anti-scald valve.

    Steps:
    1. Turn off the water to the shower, then unscrew the three handles and escutcheon plates from the existing shower valve.
    2. If the handles are rusted in place, free them with a handle puller.
    3. Use a pipe wrench to loosen and remove the stem units from the hot-water valve, cold-water valve and diverter.
    4. Hold the cover-plate template centered over the existing valve, then trace the template's outline onto the tiled shower wall.
    5. Use a drill and -inch-diameter carbide-tipped masonry bit to bore six evenly spaced holes through the tile around the template's outline.
    6. Cut the tile along the marked outline using an oscillating multi-tool fitted with a carbide-grit blade. Collect the dust with a wet/dry vacuum during cutting.
    7. Chip the tile off the wall with a hammer and ½-inch cold chisel.
    8. Cut out the old valve using a reciprocating saw with a metal-cutting blade.
    9. Dry-assemble the copper pipe and fittings to join the new pressure-balance valve to the existing hot- and cold-water supply pipes.
    10. Unscrew and remove the spindle from inside the new valve.
    11. Disassemble the parts, apply flux to the copper pipe, fittings and valve, then reassemble the parts.
    12. Next, spray water into the wall cavity with a plant mister to reduce the risk of starting a fire.
    13. Solder the new valve to the water-supply pipes.
    14. Reinstall the valve spindle that was removed in Step 10, then turn the water back on.
    15. Test the valve by sliding on the handle and turning on both the hot and cold water. Remove the handle.
    16. Roll a ball of plumber's putty between your hands to form a long ½-inch-diameter rope. Press the putty against the upper, rear section of the valve's cover plate.
    17. Screw the cover plate to the shower wall centered over the valve. Scrape away any excess putty that squeezes out from behind the cover plate.
    18. Set the escutcheon plate over the cover plate, then screw it partway onto the valve body.
    19. Slip a rubber gasket behind the rear, upper section of the escutcheon plate. Finish tightening the screws.
    20. Turn on the hot water, then use a thermometer to check the water temperature.
    21. Use a screwdriver to adjust the temperature limit on the valve to ensure the hot water doesn't get any hotter than 120-degrees F.
    22. Slip the cap assembly and handle onto the valve, then secure both with a single screw.
    23. Cover the screw head with a push-on index button.
    24. Buff the valve clean with a soft cotton cloth.
    • Difficulty: Moderate
      Requires mid-level plumbing skills
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      Tools List

      • slip-joint pliers
        Pliers
      • multi-bit screwdriver
        Screwdriver
      • drill
        Cordless drill
      • faucet-handle puller
        Handle puller, used to remove stubborn valve handles
      • pipe wrench
        Pipe wrench, used to unscrew stem units from the valve
      • 1/8-inch drill bit
        -inch-diameter masonry bit, for boring holes through tile
      • oscillating multi-tool
        Oscillating multi-tool and carbide-grit blade, used to cut tile
      • finish hammer
        Hammer and ½-inch cold chisel, for chipping tile off the wall
      • wetdry vac
        Wet/dry vacuum, used to collect dust
      • reciprocating saw
        Reciprocating saw with metal-cutting blade, for cutting out the old valve
      • tubing cutter
        Tubing cutter, used to cut copper pipe
      • plant mister
        Plant mister, used to mist the wall cavity with water prior to soldering
      • propane torch
        Propane torch, for soldering
      • digital thermometer
        Digital thermometer, used to check hot-water temperature

      Shopping List

      Single-lever pressure-balance shower valve with cover plate

      Emery cloth, for buffing clean copper pipe ends

      Lead-free solder and flux, used for soldering

      Plumber's putty, for creating a watertight seal around the valve's cover plate

      Cotton cloth, used to buff the valve clean