How to Replace a Shower Mixing Valve | This Old House

Fixing a faulty valve with This Old House plumbing and heating expert Richard Trethewey. (See below for a shopping list and tools.)

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The homeowner complains that his shower that won't provide full water pressure when both hot and cold water are mixed together. Richard determines that the problem is with the pressure-balancing cartridge inside the mixing valve and he takes the homeowner to a local plumbing supply company to get the necessary repair parts. While there, Richard also asks for a new trim package, which will update the look of the valve. Back at the condominium, Richard removes the old handle and face plate. He then closes the shut-off valves, removes the valve cap, and pulls out the old pressure-balancing unit. He then attaches new o-rings and inserts the new cartridge. He then installs a new cap with some plumber's grease for lubrication. Richard then installs a new sub-base and attaches the new trim and handle.

Shopping List for Replacing a Shower Mixing Valve:
- new shower valve
- plumber's grease, for lubricating O-rings

Tools for Replacing a Shower Mixing Valve:
- utility knife
- screwdriver
- pliers
- hex-key wrench

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Replace a Shower Mixing Valve | This Old House
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