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Replacing a Toilet Fill Valve

easyHome Repair30-60 minutes10 steps

Safety Warnings

  • Ensure the water supply valve is fully closed to prevent flooding
  • Avoid over-tightening plastic nuts to prevent cracking

Tools Needed

Adjustable wrench — check locally
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Pliers — check locally
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Sponge or towel — check locally
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Materials

Replacement fill valve assembly — check locally(1)
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Steps

1
Shut off the water supply valve leading to the toilet.
Tip: Ensure it is fully closed to prevent leaks during the process.
2
Flush the toilet and hold the handle down to drain the tank completely.
Tip: Use a sponge or towel to soak up remaining water at the bottom of the tank.
3
Disconnect the water supply line from the bottom of the toilet tank.
4
Unscrew the lock nut holding the fill valve to the tank.
5
Remove the old fill valve assembly from the tank.
Tip: Replace the assembly if the float-valve is badly corroded.
6
Install the new fill valve into the tank hole.
7
Tighten the lock nut by hand and then lightly with a wrench.
Tip: Do not over-tighten to avoid cracking the tank.
8
Reconnect the water supply line to the new fill valve.
9
Slowly open the water supply valve to refill the tank.
10
Test the valve by flushing and checking for leaks at the connections.

Pro Tips

  • If the float-valve assembly is badly corroded, it must be replaced.

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Sources

Synthesized from 2 verified sources:

USDA Farmers' Bulletin (Gutenberg)View →
Gutenberg: Simple Plumbing Repairs (FB 1460)View →