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Test for Leaks — Final Tightening and Test for Leaks

Beginner

Part of project

How to Clean Out a Bathroom Sink P-Trap · Step 6 of 6

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In this video

From the top of the sink, use your finger or a cloth to wipe away the excess plumber's putty that squeezed out around the drain. Place the stopper in the drain and fill the sink with a few inches of water. Let it sit for a few minutes. Then, check underneath the sink with a flashlight to ensure there are no drips from the new locknut or the reconnected drain pipe. If everything is dry, release the stopper and let the water drain to check the flow.

Goal: Verify the repair

  • Run your fingers around the bottom of the new connections to feel for any small drips that might not be easily visible.

Used in this video

  • Cleaning ClothWiping away excess plumber's putty.
  • FlashlightInspecting for leaks in the dark space under the sink.
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FAQs

How long does it typically take to clean a bathroom sink P-trap, and is it suitable for a DIY beginner?

This project usually takes 30-60 minutes for a beginner, including preparation and cleanup. It is considered a beginner-level DIY task because it requires basic tools and mechanical skills, primarily focused on proper loosening, cleaning, and tightening techniques for plumbing fixtures.

What's the most common mistake when reassembling the P-trap, and how can I avoid leaks?

The most common mistake is not correctly seating the slip joint washers or overtightening the nuts, which can crack plastic components. Ensure all washers are clean and properly aligned before hand-tightening the nuts, then give them a quarter-turn more with pliers for a secure, leak-free seal.

Do I really need Channellock pliers, or can I use other tools to loosen the P-trap nuts?

While Channellock pliers are recommended for their strong grip and adjustability, you can often use a pipe wrench or a large pair of adjustable pliers if you don't have them. For plastic nuts, you might even be able to loosen them by hand initially, but be cautious not to damage them.

What safety precautions should I take when cleaning out the P-trap?

Always wear protective gloves to shield your hands from grime, bacteria, and potential chemical residue. Have your bucket ready and directly underneath to catch all water and debris, preventing spills and exposure to stagnant water. Work in a well-lit area.

Transcript
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some water in and see how it works. So up top here we're going to go ahead and just remove that plumber's putty. So we'll go ahead and put in our strainer basket, we'll turn on the water for the very first time, not too much, just want to make sure it doesn't leak. So now that we have water in here, again, just enough that we cover maybe a quarter inch above where we put that new drain in and we'll make sure that there's no drips down below. So taking a look, everything looks like it is working as intended. We did pick up and there are no leaks, drips, can't say that there wasn't some before, but there isn't any now and that's the most important thing. That sounds like a job well done. And that takes us successfully through installing that sink drain, kitchen sink strainer.

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