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Tighten and Reconnect Plumbing — 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

While holding the strainer in place from above to keep it aligned, use channel-lock pliers to tighten the locknut underneath the sink until it is snug. Do not over-tighten. You should see a small amount of plumber's putty squeeze out around the flange in the sink basin. Reconnect the P-trap to the new tailpiece and tighten the slip nut by hand, followed by a final quarter-turn with pliers.

Goal: Secure the new strainer and reconnect the drain

  • Be careful not to over-tighten the locknut, which could damage the gaskets or the strainer.

Used in this video

  • Channel-Lock Pliers — Tightening the large locknut and the slip nuts.
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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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All right, so let's head up top and make sure everything is lined up. Depending on which way you want your basket strainer to go, in this case we like it this way and you can see the plumber's putty is starting to come out around the edges. If you don't see that, that means you didn't use enough, go back and put some more in. Take everything out, put more plumber's putty in so you see something like that. Snug this up right here and continue to work that down slowly, the way it pulls all that plumber's putty down. And we finished tightening this up by hand, we did push down, move that gasket over and then we also snug this up with the pliers and double checked all the other fittings, put some water in and see how it works.

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