Be sure to purchase a kit that matches your toilet.

For specialty or atypical toilet flush valve set-ups, refer to the manufacturer’s instructions to make repairs.

Turn the handle on the valve fully clockwise to shut off the water.

Leaky toilet flush valve being replaced inside toilet tank

The Spruce / Kevin Norris

Both of these are usually mounted with a bracket that clamps over the overflow tube.

Remove the old flapper or tank ball along with any brackets, guide wires, or flush lever chain.

There should be nothing left of the old assembly, only the exposed seat of the drain valve.

Materials and tools to replace a leaky toilet flush valve

The Spruce / Kevin Norris

Be careful not to drop anything into the drain valve opening, as it could clog the toilet.

Soak up this water with a sponge until the tank is fully empty.

A plastic or porcelain flush valve opening can be cleaned with a scrub brush.

Water supply turned off by turning shutoff valve under toilet

The Spruce / Kevin Norris

If you notice cracks in the valve seat, it is beyond repair and will need to be replaced.

Press lightly to set it in place.

Do not press too hard.

Old flapper removed by bracket over the overflow tube

The Spruce / Kevin Norris

The chain should pull straight up or be angled slightly back toward the hinge of the flapper assembly.

once you nail the proper location, remove the paper from the top of the sealant ring.

If you should probably adjust the chain length to achieve proper operation, do it now.

Remaining tank water soaked up with yellow sponge

The Spruce / Kevin Norris

Valve seat cleaned with fine sandpaper to scour residual debris

The Spruce / Kevin Norris

Paper peeled off sealant ring to be installed on drain seat

The Spruce / Kevin Norris

Flapper placed over sealant ring and pressed into sealant putty

The Spruce / Kevin Norris

Lift chain attached to hole in the flush rod

The Spruce / Kevin Norris

Water turned on by turning shutoff valve under toilet

The Spruce / Kevin Norris