If you're replacing a commercial garbage disposal, then you'll either want the Drain Strainer with Crown Adapter or the Drain Strainer XL. Both of these models have a universal Crown Adapter on top that serves as a funnel to cover the hole once the commercial garbage disposal has been removed. Note that it doesn't actually attach to the sink bowl, but you'll adjust the legs to get your unit flush underneath the bottom of the sink.
Should your disposal suddenly cease to work, check its overload protection. A red button on the bottom of the disposal trips when the disposal becomes jammed or overloaded to prevent damage and motor burnout. Unplug the disposal, push the button and remove the jam. Some high-end models can sense a jam and will automatically reverse the direction of the blades.
Another common cause for a leaking garbage disposal is the disposal flange. A leak at the very most upper area of the garbage disposal could be the garbage disposal flange which goes through the sink. A garbage disposal flange should be sealed with Plumber’s putty and then tightened from underneath the sink. If this is not tight enough or if it has managed to come loose (which can happen) then the garbage disposal will have to be taken down so the flange can be resealed and then the garbage disposal can be rehung.