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Disconnect Old Faucet Supply Lines — Disconnect the Old Faucet's Supply Lines

Beginner2 hours

Part of project

Replace Your Bathroom Faucet: Easy Guide · Step 2 of 5

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In this video

Using an adjustable wrench, carefully loosen the nuts that connect the water supply lines to the shut-off valves. Turn the nuts counter-clockwise to loosen. Once loosened with the wrench, you can typically finish unscrewing them by hand. Be prepared for a small amount of water to drip out from the lines into your bucket.

Goal: Disconnect supply lines

Used in this video

  • Adjustable Wrench (Tool Type: Hand Tools, Size/Weight: Medium)Loosening the nuts on the water supply lines.
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This Old House

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FAQs

The project states 'beginner' and '2 hours'. Is this realistic for someone with no plumbing experience?

Yes, replacing a bathroom faucet is generally beginner-friendly if you follow instructions carefully. The 2-hour estimate is for a smooth installation; seized nuts or tight spaces can extend this, so allocate a bit of extra time. Take your time and don't rush the steps.

Is a basin wrench truly necessary for this project, or can I just use my adjustable wrench?

A basin wrench is highly recommended, as it's designed to reach and grip the often-tight mounting nuts in the confined space under a sink. While an adjustable wrench might work for accessible nuts, the basin wrench significantly simplifies this often frustrating step, especially for older faucets.

What's the most common mistake beginners make that leads to leaks after installing a new faucet?

Not properly tightening the supply line connections is a common cause of leaks. Ensure they are hand-tight, then use a wrench for an additional quarter to half turn, being careful not to overtighten and strip the threads. Always use new supply lines, often included with your new faucet.

What should I do if the old faucet's mounting nuts are corroded or stuck and won't loosen?

First, apply a penetrating oil (like WD-40) to the nuts and let it sit for 15-30 minutes. If they still won't budge, you might need to carefully use a hacksaw or oscillating tool with a metal blade to cut through the nuts or bolts, but exercise extreme caution to avoid damaging the sink or surrounding plumbing.

Transcript
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With the water soft, you're going to use an adjustable wrench and disconnect the supply release.

Auto-generated transcript. May contain errors.