The flange comes out by loosening the mounting bolts underneath your sink

The flange is the ring that sits on top of your sink drain opening and holds the garbage disposal in place. To remove it, you work from underneath the sink, loosening three bolts that clamp the flange down, then lifting the entire assembly out from above. The job takes 15 to 30 minutes and requires only a wrench or socket set—no special tools.

Before you start, turn off the disposal at the wall switch and unplug it from the outlet under the sink. If you cannot unplug it, turn off the circuit breaker that controls it. Never work on a disposal that could start accidentally.

Key Takeaways

  • The flange bolts are underneath the sink, not on top, so you work from below to loosen them.
  • You need a wrench or socket set to turn the three mounting bolts counterclockwise until they are loose enough to lift by hand.
  • Putty or caulk around the flange rim may need scraping away before the flange will lift free.
  • Once the bolts are loose, push up from underneath while pulling down from above to separate the flange from the sink opening.

Gather your tools and clear the space under the sink

You will need a wrench or socket set that fits your disposal's mounting bolts—usually 1/2 inch or 9/16 inch. Have a bucket or towel ready because water will drip from the drain pipe when you disconnect it. A flashlight or headlamp makes it easier to see the bolts underneath.

Remove everything stored under the sink: cleaning supplies, pipes, anything that blocks your access. Lay a towel on the floor to catch water and protect your clothes. If the disposal is still connected to the drain line with a rubber coupling or slip nut, you may need to loosen that too—a pipe wrench helps, but a regular wrench works if you turn carefully.

Locate and loosen the three mounting bolts

Lie on your back or crouch under the sink and look up at the disposal. You will see three bolts arranged in a triangle around the flange. They stick out from a metal ring called the mounting ring. Use your wrench to turn each bolt counterclockwise about a quarter turn at a time, working around the triangle so you loosen them evenly.

Do not remove the bolts completely yet—just loosen them until they turn freely by hand. If a bolt is stuck, spray it with penetrating oil (like WD-40) and wait five minutes before trying again. Forcing a stuck bolt can strip the threads or break the bolt, which makes removal much harder.

Scrape away putty or caulk around the flange rim

Once the bolts are loose, go back to the top of the sink. Look around the edge where the flange meets the sink opening. If there is putty, caulk, or old plumber's putty sealing that gap, you need to scrape it away before the flange will lift out. Use a putty knife or old butter knife to chip it away.

Work slowly and scrape toward the center of the sink so debris falls into the drain rather than into your lap. This step takes patience but saves you from cracking the flange or the sink rim when you try to pull the flange up. If the seal is stubborn, a heat gun on low setting softens putty enough to scrape more easily.

Disconnect the drain line if it is still attached

Check whether the rubber drain line below the flange is still connected to the disposal. If it is held on with a hose clamp (a metal band with a screw), loosen the screw with a screwdriver and slide the clamp off. If it is a slip nut (a threaded ring), use a pipe wrench to turn it counterclockwise.

Have your bucket ready—water will pour out. Once the drain line is free, you can set it aside or cap it with a rag to keep the smell down. If you are removing only the flange and keeping the disposal, you will reconnect this line later.

Lift the flange out of the sink opening

Now the bolts are loose, the putty is scraped away, and the drain line is disconnected. Have someone help you if possible—one person pushes up from underneath while the other pulls down from above. If you are alone, push up hard with one hand while pulling the flange rim down with the other.

The flange should come free with a slight pop as the seal breaks. If it does not budge, stop and check that all three bolts are actually loose and that you scraped away all the putty. Forcing it can crack the sink or bend the flange. Once it is out, set it on a towel and inspect it for damage before deciding whether to reuse it or replace it with a new one.

Clean the sink opening before reinstalling or replacing the flange

With the flange out, scrape the sink opening clean of all old putty, caulk, and debris. Use a putty knife to get down to bare metal or porcelain. Wipe the rim with a damp cloth and let it dry completely. This step matters because old putty underneath a new flange will fail quickly, and you will have to do this job again.

If you are reinstalling the same flange, inspect it for cracks or bent edges. Small dents are fine, but a cracked flange should be replaced. If you are installing a new flange, make sure it matches your sink opening size—most are 3.5 inches, but some older sinks use 3 inches.

Frequently Asked Questions

What if one of the bolts will not turn?

Spray it with penetrating oil and wait 10 to 15 minutes. Try again with a wrench that fits snugly—a loose wrench will round off the bolt head. If it still will not budge, try tightening it slightly first, then loosening it. Sometimes a stuck bolt breaks free with that motion. If it snaps, you may need to drill it out, which requires a drill and a bit slightly smaller than the bolt diameter.

Can I remove the flange without disconnecting the drain line?

You can try, but it is awkward and risks damaging the rubber coupling. The drain line has some flex, so you might wiggle the flange out at an angle, but you will likely tear the coupling or spill water everywhere. Disconnecting it takes two minutes and saves frustration.

Is the flange reusable after removal?

Yes, if it is not cracked or severely bent. Inspect it closely under good light. Small dents and surface rust are normal. If you see cracks radiating from the bolt holes or around the rim, replace it with a new one—a cracked flange will leak and fail quickly.

Do I need to replace the putty seal when I reinstall?

Yes. Scrape away all old putty, clean the rim, and explore fresh plumber's putty or silicone caulk before reinstalling the flange. This creates a watertight seal that prevents leaks into the cabinet below. Let caulk cure for 24 hours before running water.

What if water keeps dripping after I loosen the bolts?

That is normal—the drain trap above holds standing water. The dripping stops once you fully disconnect the drain line and let it empty into your bucket. If water continues dripping from the flange itself after you remove it, you may have a leak in the line above, which is a separate issue to address before reinstalling.