• In this video, This Old House plumbing and heating expert Richard Trethewey shows how to outfit a bathroom at basement level.


    1. Using PVC pipe and fittings, connect the lavatory drain line to the macerator unit.

    2. Connect discharge pipe to the drainpipe leading from the macerator unit.

    3. Use nut driver to tighten stainless-steel clamp connecting PVC lavatory pipe to the macerator unit.

    4. Tighten the discharge adapter onto outlet port on top of the macerator unit using a nut driver.

    5. Connect the PVC vent pipe from the macerator unit to the existing vent stack.

    6. Set toilet in place and mark its mounting holes on the floor.

    7. Move the toilet out of the way and drill pilot holes into the floor.

    8. Set the toilet back into place and secure it to the floor with two brass screws.

    9. Connect toilet to the discharge pipe on the macerator unit; tighten the stainless-steel clamp with a nut driver.

    10. Connect the water-supply line to the toilet; open the shut-off valve, flush toilet and check for leaks.

    See products and services from this video
    • 2 to 4 hours, after the rough plumbing is completed
    • About $600 to $1,000
    • Difficulty: Moderate
      Requires basic plumbing skills and the ability to closely follow manufacturer's instructions

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      Video Directory

      Selected Topic/Section

      Tools List

      • nut driver
        Nut driver
        used to tighten stainless-steel hose clamps
      • drill
        fitted with Phillips driver bit and 5/32-inch drill bit

      Shopping List

      1. Macerating toilet

      required for below-grade installations

      2. PVC pipe and fittings

      3. PVC pipe primer

      4. PVC pipe cement

      5. Stainless-steel hose clamps

      used to secure connections between toilet and macerator unit