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Toilet Fill Valve Replacement Guide

mediumHome Repair30 min

This guide provides a straightforward approach to replacing a faulty toilet fill valve for homeowners looking to tackle basic plumbing repairs. You will learn how to safely shut off the water supply and install a new valve kit using a few common household tools. By following these steps, you can stop leaks and restore your toilet's filling efficiency quickly.

Safety Warnings

  • Avoid over-tightening nuts and bolts, as this can crack the porcelain toilet tank or the valve stem.

Tools Needed

Channel lock pliers — adjustable 8-inch
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Adjustable wrench — adjustable 8-inch
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Materials

Toilet fill valve kit — universal or model-specific(1)
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Plastic bucket — 5 gallon(1)
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Steps

1
Prepare the work area by placing a bucket under the water supply line and having a towel or sponge on hand to catch spills.
2
Turn off the water supply by rotating the isolation valve located on the wall behind the toilet clockwise. Flush the toilet and hold the lever down to empty as much water as possible from the tank.
Tip: Use a sponge or wet vacuum to remove the remaining small amount of water from the bottom of the tank.
3
Remove the tank lid and set it aside safely. Use pliers to disconnect the water supply line from the base of the toilet tank, draining any remaining water into the bucket.
Supply nut Drain bucket Pliers Unscrew nut Disconnect supply line and drain remaining water into bucket.
4
Unscrew the locking nut from the bottom of the tank using an adjustable wrench or pliers. Once loosened, lift the old fill valve assembly out of the tank.
Fill valve Locking nut Wrench Unscrew counter-clockwise Loosen the locking nut to release the fill valve from the tank.
5
Insert the new fill valve into the hole in the tank. Adjust the valve height so that the top sits approximately one inch below the top of the overflow tube.
Tip: Check that the refill tube is properly inserted into the overflow pipe and secured with the included clip.
Overflow tube Fill valve Float ball Adjust height Position the valve top one inch below the overflow tube.
6
Secure the fill valve by sliding the included washers onto the stem and tightening the locking nut on the bottom of the tank. Hand-tighten only to avoid cracking the porcelain.
Locking nut Rubber washer Valve stem Hand-tighten Secure valve with washer and nut; do not over-tighten.
7
Reattach the water supply line to the base of the fill valve. Hand-tighten the nut first, then use pliers to snug the connection without over-tightening.
Supply nut Supply line Fill valve Snug firmly with pliers Hand-tighten the supply nut, then snug it with pliers.
8
Turn the water supply valve back on counter-clockwise and allow the tank to fill. Check all connections for leaks and verify that the water stops about one inch below the overflow tube.

Pro Tips

  • Replace your fill valve approximately every 5 years as part of regular toilet maintenance.
  • If you are unsure of the specific valve type, a universal toilet fill valve will fit most toilets.

When to Call a Professional

If the toilet continues to run or the fill valve leaks after installation, consult a licensed plumber.

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