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Reassemble Plumbing and Test for Leaks — Test for Leaks

Beginner90 mins

Part of project

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

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In this video

Once the clog is cleared, reassemble the drain plumbing. Ensure the pipe threads and conical washers are clean. Place the washers with the tapered side pointing into the pipe connection they are sealing. Reattach the P-trap and hand-tighten all the slip nuts securely. Wipe the connections dry. Finally, run hot water into both sinks for at least a minute and check underneath for any drips to ensure all connections are watertight.

Goal: Properly reassemble the drain pipes and confirm there are no leaks

  • An improperly seated or dirty washer is the most common cause of leaks after reassembly. Double-check their condition and orientation.

Used in this video

  • Towel/Rag (brand: Generic, Tool Type: Cleaning tools, Cleaning Cloth Material: Cotton)Wiping pipes dry before testing for leaks
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FAQs

What essential safety gear should I use when cleaning a bathroom sink P-trap?

Always wear safety gloves and eye protection to shield yourself from dirty water, potential splashes of grime, and any old cleaning agents that might still be present. This project can be messy, so protecting your hands and eyes is crucial for hygiene and safety.

How long does this P-trap cleaning project typically take for a beginner, and what's the approximate cost?

This project is rated for beginners and typically takes about 90 minutes. The cost is minimal if you already own basic tools like pliers and a bucket; you might only need to purchase new slip nuts and washers if the old ones are worn, which are inexpensive.

Do I need specialized plumbing tools for this, or can I use basic household items?

While basic items like a bucket and towels are essential, you will need specific tools such as Channellock Tongue and Groove Pliers to loosen the slip nuts effectively. A flexible bottle brush is also highly recommended for thoroughly cleaning out debris inside the P-trap.

What are common mistakes to avoid during reassembly to prevent leaks after cleaning the P-trap?

The most common mistakes are misaligning the flanged washers or overtightening/undertightening the slip nuts. Ensure the washers are correctly seated, hand-tighten the slip nuts first, then use pliers for a final snug turn without stripping the threads. Always run water and test for leaks immediately afterward.

Reassemble Plumbing and Test for Leaks — How to Clean Out a Bathroom Sink P-Trap (Step 6, Video 1) | Stesso