How to install a toilet flange cap

Written by nathan mcginty
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How to install a toilet flange cap
Install a toilet flange cap on old toilet plumbing. (Jupiterimages/ Images)

If you've done some bathroom remodelling and removed a toilet, you'll be left with an open flange that needs to be capped. These flanges connect to your home's sewer system. Leaving an open flange can not only lead to accidents, but it will also allow harmful sewer gases to seep up and into your house. Install a toilet flange cap to cover the flange opening and seal the gases inside.

Skill level:
Moderately Easy

Things you need

  • Towel
  • Adjustable wrench
  • Utility knife
  • Putty knife
  • Toilet flange cap
  • Flange bolts
  • Flange nuts
  • Hacksaw

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    Remove the Toilet

  1. 1

    Turn off the water supply for the toilet located on the wall or floor next to the tank. Rotate the handle to the right to cut the water. Remove the tank lid. Flush the tank by pressing down on the handle. Watch the water in the tank and continue holding down the handle until all the water inside is gone. Wipe up any left with a towel.

  2. 2

    Unscrew the tank bolts on the underside of the tank with the wrench. Loosen the coupling connecting the water supply hose to the tank. Lift the tank off the back of the bowl and set aside.

  3. 3

    Remove the two caps at the base of the toilet concealing the flange bolts. Loosen the nuts with a wrench. Cut along the base of the toilet with a utility knife to cut the caulk. Rock the toilet bowl back and forth until it comes loose. Lift the bowl up and off the toilet flange.

    Install the Toilet Flange Cap

  1. 1

    Remove the old bolts in the flange. Clean up the excess wax around the flange with a putty knife.

  2. 2

    Insert the new bolts into the flange with the threads pointing upwards.

  3. 3

    Press the rubber flange sealer into place around the flange. Line up the holes in the seal so they fit around the bolts.

  4. 4

    Slip the flange cap into position.

  5. 5

    Tighten the flange cap down with the nuts. Saw off the protruding end of the flange bolts with a hacksaw, if desired.

Tips and warnings

  • There are a number of different toilet flange caps on the market. The above steps are just a guideline. Follow the specific instructions for your model.

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