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  1. Petercat

    Kohler K-401 Mixing valve, Cartridge Repair or Replace?

    I added a comment to this video that describes the wax motor at the heart of the Kohler thermostatic valve. Here is an excerpt: There is car thermostat shown at 7:00 in the video. The springs do not respond to temperature. Rather, the thermostat contains a "wax motor"...
  2. Petercat

    Kohler K-401 Mixing valve, Cartridge Repair or Replace?

    This excellent YouTube video, posted in 2020, will answer a lot of questions, including a two-wrench trick for removing the cartridge.
  3. Petercat

    Kohler K-401 Mixing valve, Cartridge Repair or Replace?

    My K-401 has been producing uncomfortably-hot water for a year. We built the house, and which is now 22 years old, and the Kohler K-401 was installed at that time. Our water comes from a well with hard water (about 25 grains). We've had a water softener from day 1, but iron passed through until...
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