To remove the gasket and replace it you will first have to disconnect the drain and unplug the cord to the garbage disposal. Also, if you have a dishwasher you will have to remove the dishwasher drain hose from the garbage disposal. With the drains and cord removed you can now take hold of the sides of the mounting nut and twist it counter clockwise to unlock the garbage disposal. The disposal should drop straight down.
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This is one of the biggest problems I’ve come across. When you start to notice a leak underneath your sink, it’s very easy to blame the quality of your garbage disposal. As you browse through the reviews on our website, you will probably notice I rarely mention a problem with leaking (if at all). This is because for the most part, the problem isn’t your unit but they way it has either been installed, or you could have a problem with the pipes it’s connected to.
If your garbage disposal is making a clicking or rattling sound, there may be some food particles that will not grind up inside. Remove power from disposer, reach into the sink hole with a pair of tongs and remove anything that is still down in the disposer. Test your disposer to be sure the noise is gone. If not continue troubleshooting your disposer issue (see below). 

Garbage Disposal Replacement

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