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Install the Trap Arm — Reassemble the P-Trap

Beginner90 mins

Part of project

How to Clean Out and Unclog a Bathroom Sink P-Trap · Step 5 of 6

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In this video

Take the trap arm and confirm it has a slip nut and a poly washer. Apply pipe dope to the threads of the slip nut that will connect to the wall. Insert the trap arm into the wall drain, slide the nut forward, and tighten it by hand. Use channel-lock pliers to give it a final, gentle turn to snug it up.

Goal: Connect the trap arm to the wall drain

Used in this video

  • Channel-Lock Pliers (Pliers_Type: Channel_Lock)Giving the slip nut a final tightening turn
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FAQs

What tools and materials do I absolutely need for this project, and are there any common household items that can substitute?

You'll primarily need Channellock pliers, a bucket, and a brush. A towel is also crucial for managing spills. While specific plumbing washers are listed, you might have a similar brush for cleaning, but proper pliers and a bucket are essential. Do not substitute specific plumbing washers.

Are there any important safety precautions or warnings I should consider before I start cleaning my P-trap?

Always turn off the water supply to the sink before starting to prevent unexpected water flow. Wear gloves to protect your hands from grime, bacteria, and any cleaning solutions you might use. Have plenty of towels on hand for spills, and work in a well-ventilated area if using strong cleaning agents.

This project is labeled 'beginner' and estimated at '90 minutes.' Is that realistic for someone with limited plumbing experience?

Yes, this is a very beginner-friendly project, and the 90-minute estimate is generally realistic. It accounts for gathering tools, disassembling, cleaning, and reassembling. If you encounter seized nuts or need to replace old, brittle washers (like the Oatey rubber washers), it might take a bit longer.

My sink still leaks after I reinstalled the P-trap. What's the most common reason for this, and how can I fix it?

The most common reason for leaks after reinstallation is improperly seated or worn-out slip-joint washers. Disassemble the connections, check that the rubber washers (such as Oatey 1-1/2 in. rubber washers) are correctly oriented, not cracked, and properly seated within the slip nuts. Hand-tighten nuts first, then give them a final snug quarter-turn with your Channellock pliers.

Transcript
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But anyways, you're going to start, this is called a trap arm, you're going to put a poly washer and your two jam nuts on, put some type dope on the side of the jam nut that goes into the wall, and then tighten it by hand if it's plastic or if it's chrome, you can use a wrench and just give it a little bit of a squeak.

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