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Remove the Old Fill Valve — Remove the Old Supply Line

Beginner

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How to Replace a Toilet Water Supply Line · Step 2 of 4

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Using a pair of channel-lock pliers, loosen the coupling nut that connects the water supply line to the threaded shank of the fill valve underneath the tank. Once loose, finish unscrewing it by hand. Next, unscrew and remove the large plastic locknut that holds the fill valve assembly to the tank. With both nuts removed, you can lift the entire old fill valve assembly straight out from inside the tank.

Goal: Disconnect and Remove the Existing Fill Valve Assembly

Used in this video

  • Channel-lock Pliers (brand: Unspecified, Pliers Type: Channel-lock pliers) — Loosening the water supply line coupling nut and the fill valve locknut.
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FAQs

How difficult is it to replace a toilet supply line, and how long does it usually take for a beginner?

This is a beginner-level plumbing project, typically taking only 15-30 minutes to complete. The most time-consuming part is often ensuring all connections are leak-free. The cost is usually just for the new supply line, which is quite inexpensive.

Why is a braided stainless steel supply line recommended over other types, like plastic or standard polymer lines?

Braided stainless steel lines offer superior durability and burst resistance compared to older plastic or non-braided polymer lines. They are less prone to kinking and cracking over time, providing a more reliable and long-lasting connection to your toilet. This minimizes the risk of catastrophic water damage from a burst line.

What should I do if I find a leak after installing the new supply line and turning the water back on?

First, immediately turn off the water supply again at the shut-off valve. Gently tighten the connections a small amount (about a quarter turn) with your adjustable wrench. Ensure the rubber washers or cones are properly seated and not pinched. Avoid overtightening, as this can damage the fittings or line.

What if the water shut-off valve behind the toilet is old, stuck, or won't completely stop the water flow?

Do not force a stuck valve, as it could break and cause a larger leak. If the valve doesn't fully shut off the water, you'll need to turn off the main water supply to your house before proceeding. This might also be a good opportunity to replace the old shut-off valve itself, as a separate, slightly more involved project.

Transcript
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With a pair of pliers or channel locks, loosen up the water supply line and undo it by hand. This water supply line is very stiff, hopefully yours is more flexible. Now loosen up the lock nut from your old fill valve. That's how it looks like. And now you're ready to remove the whole assembly.

Auto-generated transcript. May contain errors.