Product review (2 stars): Not a full 'kit'
Item was bought for added safety of not having to worry about what gets put down the drain  and ground up.
I bought the 'kit' to add to an InSinkErator Evolution Compact 3/4 HP Household Garbage Disposer [http://www.amazon.com/gp/product/B000G837TW]
The 'kit' did no fit the compactor without the added expense of an additional flange. In turn adding that flange would add more height to the compact unit, thus making it worthless were we wanted to use it.( under a farm kitchen sink, without ripping the wall apart).
Item may work but not in the application wee needed it to. and the instructions didn't explain that well enough. We ended up putting an ON/OFF switch under the sink and that will allow it to be operated with a minimal amount of fear to what might be placed in the drain.
In the end buying something like this should maybe have been done at the local big box, which would have required a special order but we might not have had to eat the shipping both ways and the restocking fee...  a loss of almost 25.00!