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Shower Rebuild: Installing the Mixing Valve Shower Rebuild: Installing the Mixing Valve From "Ed the Plumber" episode DETP-110

The next step in fixing a slow showerhead is to install a new mixing valve.

Materials:

Phillips head screwdriver
Flat head screwdriver
Slip joint pliers
Needle nose pliers
Mini-pipe cutter
Drywall screws
Two 1/2 inch ball valves
Assortment of copper fittings and adaptors
Pipe clips
Soldering kit for copper pipe
Fire extinguisher
Mixing valve
Spray bottle

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	Figure A
	Figure B
	Figure C
	Figure D
	Figure E
	Figure F

1. Remove the cover plate on the shower knob to reveal the screw that holds it on (figure A).

2. Loosen and remove the screws that hold the handle in place. This will allow you to take off the handle.

3. Next, remove the screws that hold your trim plate in place.

4. Use a flat head screwdriver to pry off the cover plate to reveal the mixing valve (figure B).

5. Remove any screws or nails holding the mixing valve in place.

6. Next, remove at least eight inches of insulation from each of the pipes.

7. Put your mini pipe cutter in place, then tighten it down and begin to rotate until the pipe is cut (figure C).

   Safety Note: wear safety glasses when cutting any material.

8. Cut all three pipes, finishing with the feed to the shower. When it is cut, the mixing valve should easily come free.

9. Install the ball valves (figure D).

10. Next, attach the valves to the cross pieces (figure E).

11. Prepare the valves and joints by scoring them and applying flux.

12. Remove the valve cover to prevent damage while soldering.

13. Safety Note: use extreme caution when soldering inside of a wall. Dampen any combustible items near the valve. Also, keep a fire extinguisher near by.

14. Solder the valves in place using basic soldering techniques (figure F).

15. Test to see if the anti-scald valve is setup by properly turning the water back on, then closing any open faucets and checking the temperature.

16. Check the new valve for leaks.