How to Replace a Toilet Fill Valve

If you have an older toilet, a faulty fill valve can cause it to leak, wasting water and money. Generally, your best bet is to replace it. It won’t take much time, and in this video, we’ll show you how to do it yourself. You may be interested in our How to Replace a Toilet video.

Tools

Steps

  1. How to Replace a Toilet Fill Valve - Step 1

    Remove lid from tank.

  2. How to Replace a Toilet Fill Valve - Step 2

    Shut off water by turning the shut-off valve clockwise.

  3. How to Replace a Toilet Fill Valve - Step 3

    Drain as much water out of tank as possible by holding flush lever down until toilet is completely flushed.

  4. How to Replace a Toilet Fill Valve - Step 4

    Sponge or towel out any remaining water in the tank. A shop vac also works well.

  5. How to Replace a Toilet Fill Valve - Step 5

    Disconnect the water supply tube or hose that connects the water supply valve to the fill valve.

  6. How to Replace a Toilet Fill Valve - Step 6

    Beneath the tank, loosen the lock nut that holds the fill valve to the tank.

  7. How to Replace a Toilet Fill Valve - Step 7

    Remove the old fill valve.

  8. How to Replace a Toilet Fill Valve - Step 8

    The new fill valve will go on similar to how the old one came off.

  9. How to Replace a Toilet Fill Valve - Step 9

    Reattach new fill valve and adjust float to correct height according to manufacturer’s instructions.

  10. How to Replace a Toilet Fill Valve - Step 10

    Attach new refill tube to overflow pipe.

  11. How to Replace a Toilet Fill Valve - Step 11

    Reattach water supply tube or hose to tank.

  12. How to Replace a Toilet Fill Valve - Step 12

    Turn on water, test new fill valve and check for leaks.


Read Video Transcript

If you have an older toilet, a faulty fill valve can cause it to leak, wasting water and money. Generally, your best bet is to replace it. It won’t take you much time, and the replacement part isn’t expensive.

In the next few minutes, I’ll show you how to put a new fill valve on your toilet. If your toilet is having other problems, watch our video “Diagnosing a Leaky Toilet” to figure out which component inside the tank might be leaking.

The fill valve lets water into the tank and a float keeps the water in the tank from getting too high. The valve assembly includes the float and a shut-off mechanism to stop the flow of water.

Before you visit your local independent home improvement retailer to pick up your new fill valve, here’s something you should know. The best fill valves offer anti-siphon protection. In fact, your local building codes may require this type of valve. Anti-siphon protection prevents toilet tank water from getting siphoned back into your home’s water supply. Regardless of your building codes, installing an anti-siphon valve is a good idea.

Start by turning off the water supply to the toilet.

Remove the lid to the tank. Inside the toilet, you’ll want to remove the refill tube attached to the overflow pipe on the flush valve.

Flush the toilet by holding down the tank lever to get as much water as possible out of the tank. You can use a sponge or a towel to get the rest of the water out.

Next, disconnect the water supply line from the tank. You may need to use an adjustable wrench or a pair of channel locking pliers to loosen the connection.

Then remove the old fill valve by removing the lock nut beneath the tank.

The new fill valve goes on the way the old one came off.
Place the shank washer over the threads of the shank on the new valve, flat side up. Then insert the fill valve into the hole in the bottom of the tank.

While holding it in place, use a tape measure to see if the valve is set at the proper height in relation to the overflow pipe. If you need to adjust the height of the valve, press up on the lock ring to disengage it and turn the shank to adjust the fill valve to the proper height. Once it’s set to the correct height, pull the lock ring back down to lock the shank in place.

Don’t forget to attach the refill tube to the top of the overflow pipe.

Finally, reattach the water supply connection beneath the tank and turn on the water. Finally flush the toilet to make sure that if it fills back up properly, and check for any leaks beneath the toilet. If the valve is leaking under the tank, tighten the connections.

If you have questions about this or any other home improvement project, be sure to read our list of Frequently Asked Questions for this video. And be sure to print out our Project Instructions, which includes a Tools and Materials checklist, before visiting your local independent home improvement retailer. That’s where you’ll find all the products and helpful advice to complete your project. If you’re not sure where to find your local store, check out our Store Locator.

Good luck with your project and thanks for watching.

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42 responses to “How to Replace a Toilet Fill Valve”

  1. […] How to Replace a Toilet Fill Valve | PlanItDIY – If you have an older toilet, a faulty fill valve can cause it to leak, wasting water and money. Generally, your best bet is to replace it. It won?t take mu […]

    • Robert Ramsay says:

      Thanks for the video. Seeing the job done first makes it really easy.
      From end of video to completing the job, 6 minutes.
      Cheers,
      Rob

  2. Glen Noren says:

    In step #6 above, how do you deal with a stubborn lock-nut?

    • Stewart Teaze says:

      What size is the nut? It looks about 1″ I need to know because I don’t have enough room to get vice-grips on it, and need to buy a wrench or a deep well socket to fit it.

      • Ken says:

        I held bottom lock nut with adjustable pliers and turned the old water control valve inside the tank until the lock nut on the bottom outside of the toilet fell off.

        • Michael S Giraud says:

          ended up using a pair of channel locks and destroying both the water line and the new fill valve. but whatever, it was less than a $30 fix all together 😀

  3. Diann Sloan says:

    My fill valve is not cutting of the water when it is flushed. What do you recommend?

    • Dora says:

      My toilet will not fill up when I flushed, just keeps trying to fill. How do I fix it. What do I buy to replace.

  4. B says:

    I am getting no water in my toilet tank at all. So we thought it is a defective supply tube or valve that is by wall. We cut off water supply and tried to remove but cannot. Now we have a plumber coming.

  5. Milad says:

    Im business man in iran

  6. Michael Jones says:

    Thanks a million

  7. Bett Rousey says:

    Just wanted to say thank you.

  8. Kent Mathews says:

    I followed your instructions and watched the video and the installation went perfect.
    Thanks.

  9. Carrie says:

    Perfect instructions for me as well. Just don’t know how to change float level but that’s why google is for! Thanks a million.

  10. Scott Addison says:

    Great video!!! I was able to replace both flush and fill valve. The directions that came with the parts were HORRIBLE so thank you so much for the video instructions!!

  11. Jennifer says:

    Wow! Thank you. This is a concise video, with no time or footage wasted. I really appreciate you doing this right. It makes me not loathe the internet quite as much. Keep doing what you do! With gratitude from a female homeowner down in Louisiana 🚽

  12. […] How to replace a toilet fill valve video […]

  13. sharon says:

    I can’t tell you how grateful I am for this video. Recently lost my husband so now I try to fix things… This video was the one that helped me the most. Like someone else said the instructions which came with the fill valve were confusing. I have to adjust the water level a bit …but I DID IT….
    Thank you

  14. Victoria says:

    I agree with all the positive comments! Also grateful for this video–I only had to pay $8 to fix my toilet! The instructions in this video are clear and very easy to understand. I am a single woman and tired of paying $$$ for minor home repairs so I plan to refer to this site for any future home repairs. Thank you!!

  15. Donna says:

    I have replaced my fill valve!! Went perfect but have a question. When I flush the toilet Alva the water doesn’t go out of the tank and it starts filling back up, what do I need to adjust?

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