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  1. KOHLER
  2. Toilets and Seats
  3. Troubleshooting

Extra Holes in Toilet Tanks and Bowls

Toilet Tank Holes

Tank Lid Hole

  • Some tank lids have a hole located on the back right corner. This is not a defect.
  • In manufacturing, the hole is used to drain the slip during the casting process.

Tank Hole

  • Some toilet tanks may have a hole near the top of the tank.
  • The hole is an intentional part of the tank design which provides ventilation to prevent condensation.

Toilet Bowl Holes

Rim Hole

  • Certain toilet bowls have a small “frost” hole located in the front of the bowl just below the rim.
  • The hole allows residual water from water-leak testing to exit the siphon jet chamber.
  • The toilet bowls are stored upside down to ensure water drainage prior to shipment.
  • In cold weather, the frost hole prevents water from freezing inside the bowl.

Trapway Hole

  • Some toilets contain a hole in the trapway area behind the bowl.
  • This hole is part of the design aesthetic of the toilet.

Click Here For Maintenance And Service Parts

1236669-10-B  ©Kohler Co.

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