Product review (2 stars): Necessary $55 Flange Not Included!
The kit works properly, but be warned you're probably going to need the extended flange (another $55) because without it the rubber baffle that keeps things from falling in the disposal won't go far enough down to allow the stopper/switch to work. Why Insinkerator would sell this kit without that flange is a real mystery. Once you get the unit you'll see they mention the flange as not being included, but I don't know of any installation of this adapter where it wouldn't be necessary.