How to Fix a Broken Kitchen Drain Basket: Step-by-Step Guide

Frequently Asked Questions

How do I know if my drain basket is the source of a leak?

Fill the sink with a few inches of water and watch underneath the cabinet. If water drips from where the basket meets the sink bowl, the basket seal has failed. If it drips from the slip-joint connections further down the drain, the basket itself may be fine.

Do I need plumber's putty or silicone for a drain basket?

Plumber's putty is the traditional choice and remains easier to work with for this application. Silicone sealant also works and lasts longer but is harder to remove for future repairs. Check the basket instructions — composite or acrylic sinks often require silicone since putty can stain them.

What size drain basket do I need?

Most kitchen sinks use a standard 3.5-inch drain opening. Measure your existing opening before buying. Double-check that the new basket body diameter matches — most residential replacements are interchangeable within this standard size.

Can I replace just the basket strainer without replacing the drain assembly below?

Usually yes. The strainer body (the part that sits in the sink hole) threads or clips into a mounting nut above the drain tailpiece. As long as the tailpiece and P-trap are in good shape, you only need to swap the basket portion.

How do I remove a basket that is stuck or corroded in place?

Insert a pair of needle-nose pliers or a drain wrench into the basket crossbars to hold it still, then use a pipe wrench or large channel-lock pliers on the locknut below. Apply penetrating oil and wait 15 minutes if the nut will not budge.

How long does a kitchen drain basket installation take?

For a straightforward replacement with no corroded hardware, most homeowners complete the job in 30 to 45 minutes. Corroded or seized locknuts can add time.

Replacing a kitchen sink drain basket (strainer): (1) Symptoms: leaks around the basket, basket won’t seal, broken strainer body. (2) Turn off water supply.

A leaking or cracked kitchen sink drain basket is one of the most common plumbing fixes homeowners face. The basket sits in the drain hole of the sink bowl and forms the seal between the sink and the drain plumbing. When the putty fails or the basket cracks, water seeps under the sink with every use. Replacing it is a straightforward project requiring no special skills and minimal tools.

How a Sink Drain Basket Works

The drain basket assembly has two main parts: the basket body that sits in the sink drain hole (with the strainer screen you can see from above), and the mounting hardware below the sink — typically a rubber gasket, a cardboard or friction ring, and a large plastic or metal locknut that clamps the whole assembly to the sink from underneath. Plumber’s putty seals the top flange to the sink surface.

Tools and Materials You Will Need

• Bucket and towels
• Adjustable pliers or channel-lock pliers
• Drain wrench or basket wrench (recommended)
• Screwdriver
• Putty knife or plastic scraper
• Plumber’s putty (or silicone sealant for composite sinks)
• Replacement drain basket assembly
• Penetrating oil (if hardware is corroded)

The Dearborn Brass Standard Kitchen Sink Strainer is a reliable, widely available option compatible with most kitchen sinks. A basket wrench or drain wrench makes removing the old locknut much easier and is worth owning.

Step 1: Clear Out Under the Sink and Turn Off the Water

You do not need to turn off the water supply for this repair since you are only working on the drain, not the supply lines. However, place a bucket under the P-trap before you start. Remove everything from the cabinet under the sink to give yourself working room.

Step 2: Disconnect the Drain Tailpiece

The tailpiece is the short straight pipe that drops from the bottom of the drain basket to the P-trap. Loosen the slip-joint nut at the top of the P-trap where it meets the tailpiece. The tailpiece is either threaded onto the bottom of the basket assembly or held with a slip nut. Unscrew it and set it aside — you will likely reuse it.

Step 3: Remove the Old Basket

Look up under the sink at the bottom of the drain basket. You will see the locknut — a large plastic or metal nut threaded onto the basket body. Use channel-lock pliers or a basket wrench to unscrew the locknut counterclockwise. While turning the nut, hold the basket above from inside the sink so it does not spin. A basket wrench that fits across the crossbars of the strainer makes this much easier.

If the locknut is plastic and stuck, apply penetrating oil around the threads and wait 15 minutes before trying again. For corroded metal locknuts, penetrating oil plus patient, steady pressure is usually enough.

Once the locknut is off, slide off the friction ring and rubber gasket. Then push the basket body up and out from below, or lift it out from above.

Step 4: Clean the Drain Opening

Use a putty knife or plastic scraper to remove all old plumber’s putty from around the drain opening on the top of the sink. Clean both the sink surface and the underside of the opening thoroughly. Old putty that is left behind will prevent the new basket from seating flat and can cause a new leak.

Step 5: Apply Plumber’s Putty and Set the New Basket

Roll a rope of plumber’s putty about 3/4 inch in diameter and press it around the underside flange of the new basket strainer. The putty should form a complete ring with no gaps.

Press the basket down firmly into the drain opening from above. Some putty will squeeze out around the edges — that is expected and correct. Do not wipe it off yet.

Step 6: Install the Mounting Hardware

From under the sink, slide the rubber gasket onto the basket body threads (beveled side up, toward the sink), then the friction ring, then thread the locknut on by hand. While holding the basket still from above (use a screwdriver through the crossbars to keep it from spinning), tighten the locknut with the basket wrench or channel-lock pliers. Tighten until the basket is snug and does not rotate. Do not over-tighten to the point of cracking a plastic locknut.

The basket flange on top should be seated flat against the sink surface. Go back up top and wipe away the excess putty that squeezed out with a damp rag.

Step 7: Reconnect the Tailpiece and Test

Thread the tailpiece back onto the bottom of the new basket assembly and reconnect the P-trap slip joint. Hand-tighten the slip-joint nut, then snug it one quarter turn with pliers — do not over-tighten these plastic nuts.

Fill the sink with several inches of water, then open the drain and watch underneath for any drips. A properly sealed basket will be completely dry. If you see a drip around the top flange, the putty did not seat — disassemble, add more putty, and repeat.

Replacing a drain basket takes less than an hour and stops an ongoing leak that can silently damage cabinet floors and encourage mold growth.