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Connect and Adjust Flapper Chain — Install New Flapper and Prepare for Fill Valve

Beginner2 hours

Part of project

How to Replace a Toilet Fill Valve and Flapper · Step 3 of 6

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In this video

Connect the flapper chain to the new lever arm and adjust its length for proper operation. Hook the chain to one of the holes on the arm. The goal is to have minimal slack when the flapper is closed. Test the flush. If the toilet runs continuously, the chain is too tight. Use pliers to open the chain's clasp and move it to a different link to add more slack. Repeat this until the flapper seals perfectly after flushing, but is still lifted effectively during the flush. Also ensure the fill valve's float chain is not tangled with the new lever.

Goal: Toilet Repair

Used in this video

  • Pliers (Tool Type: Hand Tools, Pliers Type: Needle-nose pliers)Opening and closing the metal clasp on the flapper chain for adjustment.
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FAQs

What are the most important safety precautions I should take when replacing a toilet fill valve and flapper?

Always start by turning off the water supply to the toilet completely using the shut-off valve behind the toilet. Flush the toilet to drain the tank and bowl as much as possible. Have towels and a bucket ready to catch any residual water, and consider wearing gloves for hygiene and grip.

The project is rated 'beginner' and '2 hours.' Is this realistic for someone who has never done plumbing before?

Yes, this project is genuinely beginner-friendly. It primarily involves unscrewing and screwing on nuts by hand or with simple tools. While 2 hours is a good estimate, allow yourself a bit more time if it's your first time to read instructions carefully and avoid rushing. It's a great project to build confidence in DIY plumbing.

Do I need the specific Husky wrench and Channellock pliers mentioned, or are other adjustable wrenches sufficient?

You do not need those exact brands. Any good quality adjustable wrench (10-12 inches) will be essential for securing the fill valve nut. Slip-joint pliers are very helpful for removing stubborn connections but often an adjustable wrench can handle most tasks. Ensure your tools are in good working order.

After replacing the fill valve and flapper, my toilet is still running or leaking. What should I check first?

First, ensure the fill valve's water level adjustment is set correctly; the water should stop filling about 1 inch below the top of the overflow tube. Next, check that the flapper seats perfectly over the flush valve opening and that its chain isn't too tight or too loose, which could prevent a proper seal. Also, double-check that the fill valve mounting nut underneath the tank is tightened sufficiently but not overtightened.

Transcript
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directly over the flapper and let's see if my chain is long enough. It's tight and it clashes but it's like the water's still running so let's adjust it out, I'll try it on the end here and it looks like the water's still just flowing through. Test your flapper. If there's any gap like that it'll just keep running. So we're going to have to adjust the chain. Mine's a ball chain and there's like a little little clasp on there. I'd use pliers to get it off and just move it up a couple of links. We want to keep it snug but like I said not too tight otherwise the water will keep running. And we'll put that back in that second position and look at that. Let's stay seated. All right, first problem solved. What's that chain dangling in the back there? Oh, see that? It tanks full. So let's put our lock in place because that lever definitely worked. Okay, so this right here releases the refill. I don't know, I guess it's like a float lock stop and it needs to be pulled up to release the float so it doesn't keep filling. So basically we want to make that snug on the lever as well. So that way it releases and activates the refill. Spread this up for your viewing pleasure. I know it gets boring. And to that, all right, the water stopped. We're good. And I'm going to shoot. All right, hold it as long as we need to. Water goes down and wait a second. It didn't refill. The chain wasn't tight enough. So we're going to have to reposition that chain on our hook. So it's a little more snug. All right, you see that? Nice and tight. We'll pull it up. It releases the catch.

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