How to Replace a Kitchen Sink Drain

Replacing a kitchen sink drain is a straightforward DIY repair that solves slow draining, leaks under the sink, or a worn basket strainer. You can usually finish the job in under an hour with basic tools, without removing the sink or calling a plumber.

Tools and Materials

• New kitchen sink drain assembly or basket strainer
• Plumber’s putty or a rubber gasket
• Adjustable pliers or a strainer wrench
• Screwdriver
• Bucket and towels

Step-by-Step Guide

1. Turn off the water and clear the cabinet. You are working on the drain, so the water can stay on, but remove everything under the sink and place a bucket beneath the drain.
2. Remove the trap and old drain. Loosen the slip nuts on the P-trap and disconnect it from the tailpiece. Then unscrew the large locknut that holds the basket strainer to the bottom of the sink.
3. Clean the drain opening. Scrape away old putty and debris from the sink hole so the new strainer seals evenly.
4. Set the new strainer. Roll a rope of plumber’s putty and press it under the strainer flange, or use the rubber gasket if your new drain includes one. Press the strainer into the drain hole from above.
5. Tighten the assembly from below. Slide the rubber washer and cardboard friction washer onto the strainer body, thread on the large locknut, and tighten it with pliers while holding the strainer still. Do not overtighten.
6. Reconnect the trap. Attach the tailpiece to the new drain and reconnect the P-trap, making sure the slip nuts and washers are aligned.
7. Test for leaks. Run water for several minutes and check under the sink. Tighten the locknut or slip nuts slightly if you see any drips.

Frequently Asked Questions

Do I need plumber’s putty to replace a kitchen sink drain?

Most basket strainers work best with plumber’s putty or a rubber gasket to create a watertight seal. If your new drain includes a gasket, you can use that instead of putty.

How do I know if my kitchen sink drain needs replacing?

Replace the drain if the strainer is cracked, rusted, or leaking at the sink connection, or if the basket no longer seals properly. Slow draining that is not fixed by cleaning the trap may also point to a damaged drain assembly.

Can I replace a kitchen sink drain without removing the sink?

Yes. The drain is accessed from inside and below the sink, so the sink can stay in place during the entire job.

For related plumbing guides, see standard kitchen sink drain size and sink draining slowly with no blockage.