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Tighten the Faucet Mounting Nut — Remove the Faucet's Mounting Nuts

Beginner2 hours

Part of project

Replace Your Bathroom Faucet: Easy Guide · Step 3 of 5

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In this video

Position yourself underneath the sink to access the faucet's mounting hardware. The looseness is caused by the retaining nut that has worked its way loose over time. Place the jaws of the basin wrench around this nut. Turn the wrench handle to tighten the nut until it is snug. Ensure the faucet is properly aligned before fully tightening.

Goal: Secure the faucet to the sink

  • Be careful not to over-tighten the nut, especially on a porcelain or ceramic sink, to avoid cracking it.
  • Have a helper hold the faucet straight from above while you tighten it from below.

Used in this video

  • Basin Wrench (Wrench_Type: Basin wrench, Basin Wrench Design: Fixed head)Tightening the faucet mounting nut.
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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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All you need is a basin wrench. These aren't very expensive. You can get them almost anywhere. All that's happened is a nut underneath the tap has come loose. So you get your wrench and simply tighten it up. There you go. Tight.

Auto-generated transcript. May contain errors.