This valve controls the refill of water in your tank after you flush.

Tip

Replacement seals for Fluidmaster fill valves are widely available at home centers and hardware stores.

You should have no trouble finding one.

Fluidmaster toilet fill valve being replaced inside toilet tank

The Spruce / Kevin Norris

And while you’re at it, pick up an extra for the next time you have a problem.

Do you notice a leak coming from any part of the fill valve?

If not, lift the arm attached to the float as the tank fills up.

Materials and tools to repair a fluidmaster toilet fill valve

The Spruce / Kevin Norris

When you lift the arm, the water should stop.

The shutoff valve is usually located on the wall below the toilet tank and has a small handle.

The valve will be connected to a water supply tube leading to the bottom of the toilet tank.

Shutoff valve pointed out underneath toilet

The Spruce / Kevin Norris

Flush

Flush the toilet to remove most of the water in the tank.

Use your other hand to turn the cap on top of the fill valve counterclockwise 1/8 of a turn.

It may help to push down on the cap while turning.

Water shut off by turning the shutoff valve under the toilet

The Spruce / Kevin Norris

Lift the cap from the top of the valve and set it aside.

The valve seal is inside the cap.

This flushes any debris from the valve.

Toilet being flushed with tank cover removed showing water and mechanics inside

The Spruce / Kevin Norris

terminate the Valve

Now terminate the shutoff valve by turning clockwiseuntil it stops.

Take off the Old Seal

Then remove the old fill valve seal from the valve cap.

Turn on the Shutoff Valve

pop kick open the shutoff valve slowlyturning counterclockwiseuntil the handle stops.

Plastic cap on fill valve taken off while holding the fill valve shaft

The Spruce / Kevin Norris

Also, check for any leaks at the shutoff valve.

It’s easy to change thetoilet fill valveand takes about 30 minutes.

The steps are straightforward, and the part is usually easy to find at any hardware store.

White mug positioned over top of fill valve in toilet tank

The Spruce / Kevin Norris

Toilet flush handle pushed down with water shooting out of fill valve into mug

The Spruce / Kevin Norris

Shutoff valve turned shutting of water

The Spruce / Kevin Norris

Old fill valve seal removed from valve cap in toilet tank

The Spruce / Kevin Norris

New valve seal inserted into stainless steel needle of cap

The Spruce / Kevin Norris

Fill valve cap reinstalled on the valve

The Spruce / Kevin Norris

Shutoff valve handle turned clockwise

The Spruce / Kevin Norris

Toilet tank refilled with water with handle pushed down to check fill valve

The Spruce / Kevin Norris