How to Install a Toilet Bolt Cap

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Things You'll Need

  • Adjustable wrench

  • Steel wool

  • Caulk or silicone sealant

Toilet bolt cap set

Household toilets are anchored to the floor by two bolts that attach to a flange beneath the base of the toilet. The steel bolts are usually brass plated to resist rust in damp bathroom environments. Left exposed, though, the bolts and the nuts that secure them to the toilet will corrode from moisture and cleaning chemicals. Toilet bolt caps prevent this by covering the hardware with a waterproof dome-shaped seal. In addition to protecting the screws, they make the toilet easier to clean and give it a more finished appearance. Typical installation takes only a few minutes.

Step 1

Clean the toilet flange bolt threads with a damp cloth or steel wool. If they're rusty, apply a few drops of light oil.

Step 2

Snap-off style toilet flange bolt

Check the length of the exposed flange bolt to ensure the cap is deep enough to cover it. If it's too long, cut off the excess with a hacksaw or snap it off at the indented area.

Step 3

Remove the nut from the flange bolt by turning the nut counterclockwise with a wrench. Remove any washers beneath the nut.

Step 4

Press the snap-on cap insert over the bolt with the lipped side up. Replace the washers and install the nut.

Step 5

Snap the toilet bolt cap onto the insert.


If the flange bolts are damaged or hard to remove, fill the bolt cap with caulk or silicone sealant and press it directly over the bolt.


Be careful not to overtighten the flange bolt nuts when reinstalling them.


Meg Jernigan

Meg Jernigan has been writing for more than 30 years. She specializes in travel, cooking and interior decorating. Her offline credits include copy editing full-length books and creating marketing copy for nonprofit organizations. Jernigan attended George Washington University, majoring in speech and drama.