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Remove Old Fill Valve — Remove the Old Toilet Fill Valve

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How to Replace a Toilet Fill Valve: A Step-by-Step DIY Guide · Step 2 of 4

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In this video

Place a towel on the floor beneath the tank connection to catch drips. Unscrew the water supply line connector from the bottom of the fill valve shank by turning it counter-clockwise. Then, unscrew the large plastic locknut that secures the fill valve to the tank. If it's too tight, use an adjustable wrench to loosen it carefully. Once the nut is removed, lift the entire old fill valve assembly out from inside the tank.

Goal: Disconnect and remove the existing fill valve

  • Be gentle when using a wrench on the plastic nut to avoid cracking the toilet tank.

Used in this video

  • Towel (Towel Material: Cotton)Catching residual water drips.
  • Adjustable Wrench (Tool Type: Hand Tools, Adjustable Wrench Size: 10-inch) · optionalLoosening the plastic locknut if it is too tight to remove by hand.
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FAQs

What specific tools will I need for this project, and are there any alternatives if I don't have them?

You'll primarily need an adjustable wrench, like the Crescent 12 in. model, to loosen and tighten the lock nut. While pliers can sometimes work, an adjustable wrench provides better grip and reduces the risk of stripping the nut. A sponge, such as the HDX Multi-Purpose Sponge, is also very helpful for soaking up residual water.

What is the most critical safety step I need to take before starting to replace the fill valve?

The most critical step is to turn off the water supply to the toilet completely, usually via the shut-off valve on the wall behind the toilet. Once the water is off, flush the toilet to empty the tank as much as possible, using a sponge for any remaining water. This prevents leaks and makes the job much cleaner.

How long should this DIY project take for someone with no prior plumbing experience, and what's the typical cost for materials?

For a beginner, replacing a toilet fill valve typically takes about 30 to 60 minutes from start to finish, including setup and cleanup. The Korky QuietFill Toilet Fill Valve mentioned costs approximately $15-$25, making this a very affordable repair.

After installing the new fill valve, my toilet keeps running or the water level is too high/low. How do I fix this?

First, check the float height on your new fill valve; it should be adjusted so the water level stops just below the overflow tube. If it keeps running, ensure the refill tube is properly inserted into the overflow pipe and that the lock nut under the tank is securely tightened to prevent external leaks.

Transcript
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I put a towel down to catch whatever a little bit of water might come out, and then I disconnected the supply line. The plastic nut on the bottom of the toilet is supposed to be finger tightened, but I couldn't get it off with my bare hands, which is kind of weird since I'm the guy who put it on, so maybe these years haven't been kind to me. With the plastic nut completely off, I removed the old fill valve assembly.

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