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Replacing Drain Traps

Project Overview

Replacing Drain Traps

Drain traps – those U-shape pieces of drain pipe underneath your sink – do a lot of dirty work. Occasionally, they leak, become corroded, or get plugged with years of accumulated soap and grease. When that happens, replace an old trap with nice new ones. Traps are made from ABS (black), PVC (white), or brass (either chrome plated or natural coloured.) Replace your drain trap with the same type of trap you remove. Traps come in 1 1/4 inch or 1 1/2 inch inside diameter sizes. Be sure you get the right size replacement.

5 Steps

  1. Remove the Old Drain Trap Assembly
  2. Attach the Tailpiece
  3. Attach Fittings
  4. Attach Trap Arm to the Drain Stub-Out
  5. Attach the Trap Bend to the Trap Arm
Remove the Old Drain Trap Assembly

Step 1

Remove the Old Drain Trap Assembly

Completely remove the old drain trap assembly. Don't try to salvage any parts -- it's not worth the aggravation. Replace them all with new ones.

Attach the Tailpiece

Step 2

Attach the Tailpiece

Put a tailpiece washer into the flared end of the tailpiece, then attach the tailpiece by screwing the slip nut onto the sink strainer. If necessary, you can cut the tailpiece to fit with a hacksaw.

Attach Fittings

Step 3

Attach Fittings

If you're working on a sink with two basins, use a continuous waste-T-fitting to join the tailpieces. Attach the fitting with slip washers and nuts. Make sure the beveled sides of washers face the threaded portion of the pipes. Putting a little pipe lubricant on the slip washer will ease installation and ensure a tight fit.

Attach Trap Arm to the Drain Stub-Out

Step 4

Attach Trap Arm to the Drain Stub-Out

Attach the trap arm to the drain stub-out, using a slip nut and washer. Remember to keep the beveled side of the washer facing the threaded drain stub-out. If necessary, the trap arm can be cut to fit with a hacksaw.

Attach the Trap Bend to the Trap Arm

Step 5

Attach the Trap Bend to the Trap Arm

Attach the trap bend to the trap arm, using slip nuts and washers. The beveled side of the washers should face the trap bend. Tighten all the nuts with a pair of slip joint pliers. Never use Teflon tape on white plastic pipe threads and fittings.

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Project Details

Skill Level: Beginner

Time: 1 hour

Before you start, read this »

Due to differing conditions, tools, and individual skills, The Home Depot® assumes no responsibility for any damages, injuries suffered, or losses incurred as a result of attempting to replicate any of the home improvement ideas portrayed in this website Before beginning any home improvement project, review it thoroughly to ensure you or your contractor can finish the project and if any doubts or questions remain, consult local experts or authorities. Because codes and regulations vary greatly, you always should check with authorities to ensure that your project complies with all applicable local codes and regulations. Always read and observe all of the safety precautions provided by any tool or equipment manufacturer, and follow all accepted safety procedures.


  • Replacement trap
  • Pipe lubricant

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