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Replace a Sink P-Trap

A practical homeowner guide to replacing an under-sink p-trap. Follow the safety checks, confirm the exact part or model, and test your work before considering the repair complete.

ModerateNo signupUSA homeowner guide

Before you start

Safety checkpoint: Avoid forcing misaligned fittings or modifying concealed plumbing. Follow applicable local codes and the manufacturer's instructions.

Look for corrosion, moisture staining, and the condition of nearby shutoff valves before taking anything apart. Photograph the original connection so you can restore the arrangement correctly.

Tools and supplies

  • Bucket
  • slip-joint pliers
  • replacement trap
  • towel

Tools & Materials for This Project

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Also prepare eye protection, a clean workspace, and any product-specific tools or fittings listed in the installation manual.

Step-by-step: Replacing an under-sink P-trap

Read the entire procedure before starting. Use the product manual and local code requirements where they are more specific.

  1. Identify pipe diameter and material, and measure trap-arm alignment before buying replacement pieces.
  2. Place a bucket below the trap; do not work on a drain recently treated with chemical cleaner.
  3. Loosen slip nuts and remove the trap carefully, keeping track of washer direction and joint placement.
  4. Clean the tailpiece and wall trap-arm mating surfaces; inspect for cracks and corrosion.
  5. Dry-fit the new trap with a continuous downward path to the wall connection and without stressing the joints.
  6. Install slip-joint washers with the tapered side toward the fitting seat; tighten by hand, then gently snug if necessary.
  7. Fill the sink and drain it several times; wipe every joint dry and inspect for moisture.
Stop and hire a qualified professional if you discover hidden leaks, damaged wiring, unsafe access, structural damage, or a condition beyond this guide.

Common mistakes to avoid

  • Do not glue slip-joint fittings or use tape to compensate for wrong washer sizes.
  • Avoid flexible accordion traps, which collect debris and may not comply with local plumbing codes.
  • If the wall pipe is corroded or leaking inside the wall, stop and call a plumber.

Helpful video tutorials

Watch a relevant demonstration before starting. Check the model, safety steps and local code requirements for your project.

How-To: How to Replace a P-Trap
How-To: How to Replace a P-Trap

Direct YouTube link — playback not independently verified.

Watch video ↗
How To Repair or Replace a P-Trap or Sink Drain Pipe
How To Repair or Replace a P-Trap or Sink Drain Pipe

LarpMix — YouTube candidate; playback and content not independently reviewed.

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How to Unclog a Sink P-Trap (Step-by-Step DIY Fix)
How to Unclog a Sink P-Trap (Step-by-Step DIY Fix)

Remodel Upgrade — YouTube candidate; playback and content not independently reviewed.

Watch video ↗

Direct links are identified as such. Search cards are not reviewed videos. Videos are hosted by their respective creators.

DIY or hire a professional?

A plumber should handle inaccessible piping, failed shutoff valves, recurring leaks, or any damaged subfloor. A professional quote should explain labor, materials, disposal, warranty, site conditions and any permits. Compare identical scopes, not just total prices.

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