• In this video, This Old House plumbing and heating expert Richard Trethewey explains how to repair a pressure-assisted toilet.


    1. Turn off water to toilet by closing the shut-off valve.
    2. Flush the toilet to empty tank.
    3. Disconnect water-supply line from toilet.
    4. Unbolt tank and lift it off toilet.
    5. Use pliers to take off spud nut from bottom of tank.
    6. Unscrew nut holding fill tube to bottom of tank.
    7. Slide the pressure-assist unit out of the tank.
    8. Use a utility knife to cut off the defective pressure regulator.
    9. Install new pressure regulator and attach with stainless steel hose clamp.
    10. Reinstall the pressure-assist unit and bolt on the toilet tank.
    11. Turn on water and flush toilet to test new regulator.
    See products and services from this episode
    • Difficulty: Moderate
      The repair is simple enough, but it requires disconnecting and disassembling the toilet

Contribute to This Story Below

      Video Directory

      Selected Topic/Section

      Tools List

      • adjustable wrench
        Adjustable wrench
        used to loosen water-supply connection
      • adjustable pliers
        Large-capacity pliers
      • utility knife
        Utility knife
      • ratcheting screwdriver
        used to tighten hose clamp

      Shopping List

      1. Replacement pressure regulator

      2. Canvas drop cloth,
      for protecting floor