Found this info for you, Diane
Do you mean the rubber flab on the sink drain or the drain itself?
Hi Diana: Is it stopped up and not running? If so, push the red reset button on the bottom or side of the disposal that's under the sink. See if that works. If not, unplug the disposal, turn the power on just to make sure it's off, then turn the switch back to off. Then, The rubber flap will come out with a little encouragement and you can look inside with a flashlight. Remove anything that's in there and, get a broomstick and put it into the disposal and push until it turns. Remove the broomstick, plug it back in and see if that works. If it's just icky in the pipes, pour you will need this:
A small box of baking soda
1/2 cup vinegar
1 quart of water
If that doesn't work, the bottom part of the pipe that looks like a U, comes off by unscrewing one part and sliding it apart. There may be something in there that's clogging the drain. Put a pot under the area to catch whatever evils will come out:) You may have to get a new washer, and if you do, take the old one to the store with you so that the salesperson will know exactly what you need. This isn't hard to do at all. You may have a blockage in the dishwasher hose, also. If that's the problem, I found a site for you that might help. Good luck.
Besides hitting the red reset button there is also an allen wrench key that comes with the disposal that fits in the bottom of the garbage disposal, turn it a couple times and try turning it on.... if it doesn't work the first time try again. I do put a small flashlight in the disposal to see if something is blocking it. I've fished out parts of cat can lid, turkey key, pennies, toothpicks etc.
If its the odor, cut a lemon in half and grind it up, then do the other half.
I also use Roebic Drain Cleaner which is a bacterial cleaning with no chemicals down mine once or twice a year.
I use Lemi Shine for drains You can find it in the grocery stores
Cleans the garbage quick and easily.
There should be a clean out under your sink for the disposal.. Or you may need to remove the "Trap" to clean
Step 1: With the disposal and faucet turned off, put six ice cubes in the chamber followed by 1 tablespoon of baking soda, three thin lemon slices, and 1 teaspoon of bleach. Top it all off with six more ice cubes. Step 2: Turn the disposal on without running water until you hear the grinding stop
There is usually a little wrench that comes with the disposal to help clear it out
This may help. https://www.homemadesimple.com/kitchen/how-to-clean-your-garbage-disposal/?gclid=Cj0KCQiA-OeBBhDiARIsADyBcE5eA_3hl5eWrr61Amaf0W0phLCBkPt4k1eHhf377vQqB1KVaMxDZqwaAoouEALw_wcB
This product unclogs and cleans - works great: https://amzn.to/3sGmmsh
Hi Diana, hope this helps you out,
I sprinkle baking soda in then douse with vinegar. I also occasionally toss a handful of ice cubes in then run the disposal.