Another reason to change the seal is when it becomes hard to flush the toilet.

An old, stiff flush valve seal can put extra stress on the handle or chain.

Hold down the flush handle to empty as much water from the tank as possible.

Tower-style flush valve pulled out of toilet tank

The Spruce / Kevin Norris

Use a bucket as needed to remove any excess water.

Some tower flush valves do not have this, but the Kohler models do.

The refill tube needs to be removed before you could get the seal off of the tower.

New tower flush valve seal to replace in toilet

The Spruce / Kevin Norris

Work the valve seal up and out of the groove all the way around the tower.

Keep the seal moving up the tower a little at a time until it is off.

Check to verify that the seal is completely in the groove.

Water turned off through turning shutoff valve under toilet

The Spruce / Kevin Norris

Replace the Refill Tube

Reinstall the refill tube in the same manner as it was originally positioned.

Otherwise, position the clip in its original position.

Turn the Water On

Turn the water supply back on.

Toilet flushed on tap to empty tank to replace tower-style flush valve

The Spruce / Kevin Norris

Wait for the toilet tank to fill then check to verify that the toilet flushes correctly.

see to it that the new flush valve seal sits snugly on the tank opening.

Refill tube removed from top of overflow pipe

The Spruce / Kevin Norris

Tower-style flush valve removed from toilet tank to take out rubber seal

The Spruce / Kevin Norris

New flush valve seal positioned on top of tower-style flush valve

The Spruce / Kevin Norris

Refill tube reinstalled to clip of tower-style flush valve

The Spruce / Kevin Norris

Shutoff valve handle turned to turn water on

The Spruce / Kevin Norris

Toilet tank cover added back to flush toilet

The Spruce / Kevin Norris