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

  1. gtgalen says:

    In photo #11, hand tighten, never use a wrench or a channel lock. Too often, the tool over tightens and causes damage.

  2. Bnpositive says:

    Had to replace the fill valve and the flush valve this morning on my toilet. Glad I had those two videos available to let me know what I was getting myself into tackling the job myself. Wasn’t hard at all and only took about 30 minutes total for both.

  3. […] How to Replace a Toilet Fill Valve (planitdiy.com) […]

  4. She_Did_it_Solo says:

    Changed the fill valve on the toilet in a secondary bathroom. The video was a tremendous help with the minor details necessary to complete the process. It cost less than $8 to do it myself. The plumber charge $60 for this service on my other toilets. Thanks to the video!!!

  5. Viviana says:

    Thanks for the video! Now I’m on my way to replacing the fill valve in my toilet! Yay! I appreciate the great camera angles and lighting and very clear verbal instructions.

  6. Paula says:

    How do I know what the correct height is — as in step 9?

    • Tristan says:

      Just place the new one alongside of the old one you removed and use that as your guide to gauge the height you need to adjust the new one to.

  7. Chase says:

    Thanks. The video and instructions were detailed and show just how easy it can be done. Thanks again!

  8. Sandy says:

    This video was so helpful, it gave me the confidence to replace my fill valve, I’ve done handle and flapper, but never fill valve. It took only a trip to store back home and it’s all working. Thank you

  9. […] How to Replace a Toilet Fill Valve | PlanItDIY […]

  10. helijemi says:

    I like this video and also share this with my friend…
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  11. JEFF JURAN says:

    Great video with easy to follow directions and the pictures for each steps 1 – 12 was very helpful also. My most difficult step was removing the old fill tank That lock nut was on very tight and did not want to come off. Once removed the install of the new fill tank took ten minutes. .

  12. Doug N says:

    Does the rubber hose have to stream water into the overflow, or can it just spray into the tank? Thanks!

  13. Kevin says:

    one question. so frustrating. Using new toliet connector, I was unclear on if that should be hand tightened or wrech tightened into water supply. Directions of Fluidmaster 400A Fill Valve say hand tighten to fill valve. NO mention on HOW to tighten into water supply. I hjand tightened and it leaked hard. Then, After not knowing wtf was up, I used wrench. No leak. I know its minor and perhaps common sense, but as directions read “to prevent flooding and property damage, no NOT over tighten” caught my attention. I get frustrated easily and felt it was so obvious I should have known. Also, Fluidmaster brand Universal 12″ toliet connector. This thing has three universal adaptor kit pieces. Now who would know what size to use to connect to water supply? not me. i tried the first one, gold which is 3/8″. Fit and screwed in. Thought i had wrong size but looked online and google said that one and 1/2 inch would work. But for the life of me I was trying to get that piece OUT of toliet connector to see if another size would work. For future reference, if there are 3 pieces to a kit, in the event that the first one doesnt work how on Gods green earth do you get it OUT? i tried needle nose, screw driver, tweezers. Its like once u try u cant get it out to try another. if that is the case, why have THREE pieces included? nothing to do w ur vid but just drove me nuts! Your vid wqas great tho, taught me pretty much all, minus han d or wrench tight for connector into water supply. Thank you and you are beautiful!!! Kevin

  14. Sharon says:

    Thank you very much! You made it so simple. I got it done before the kids were up.

  15. […] How to Replace a Toilet Fill Valve | PlanItDIY – Video embedded  · 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 […]

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  18. Cate says:

    Just watched the video and had the install done in about 20 minutes.. Super easy even for this old gal. Thank you so much!

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