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Secure Connections and Turn on Water — Install the New Toilet Fill Valve

Beginner2 hours

Part of project

Fix Leaky Toilets: A Step-by-Step Guide to Replacing Your Fill Valve · Step 4 of 6

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In this video

From underneath the tank, screw the new plastic locknut onto the shank of the fill valve and hand-tighten it securely. Do not use pliers, as over-tightening can crack the plastic. Next, reattach the water supply line to the bottom of the new fill valve, also hand-tightening it firmly. Once all connections are secure, slowly turn the water shut-off valve counter-clockwise to turn the water back on. As the tank fills, check for any leaks at the supply line connection and the locknut.

Goal: Connect the water supply and check for initial leaks

  • Hand-tighten only. Using a wrench on the plastic locknut or supply line connector can cause cracking and lead to flooding.

Used in this video

  • Towel (Towel Material: Cotton) — Drying connections to make leak detection easier.
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FAQs

My new fill valve is leaking where it connects to the water supply line. What should I check?

First, ensure the connection is hand-tightened, then gently snug it with your adjustable wrench, being careful not to overtighten and strip the threads. Also, check that the rubber washer inside the coupling is properly seated and not pinched or missing; a new washer may be needed if it's damaged.

Is replacing a toilet fill valve truly a beginner-friendly project, and how much time should I set aside?

Yes, this project is very beginner-friendly and perfect for a first-time DIYer. Most people can complete the entire process, including preparation and testing, within 1 to 2 hours. Taking your time and carefully following each step will help ensure a successful repair.

What crucial safety precautions should I take before starting this toilet repair?

Always begin by turning off the water supply to the toilet, usually via a small shut-off valve at the wall or floor. After turning it off, flush the toilet to empty the tank as much as possible to minimize water spills when you disconnect lines and remove the old valve.

Besides an adjustable wrench, are there any other tools I might need for this project?

An adjustable wrench, like the Husky 12 in. Adjustable Wrench, is the primary tool you'll need. You might also find a bucket helpful to catch any residual water from the tank or supply line, and a sponge or old towel for easy cleanup of small spills.

Transcript
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Alright, that's tucked away nicely now, let's attach this log nut. Make sure this log nut is tight, but there's no need to use pliers, hand tie on all these parts as all you want. Now we'll reattach this to the pyline and same with this, just hand tight. Alright, looks like everything up here is nice and tight, that is good, and then we'll check and make sure this is tight one more time and then we'll turn on the water. And while we're down here, we'll go ahead and check for any obvious leaks and everything looks good.

Auto-generated transcript. May contain errors.