Product review (5 stars): Great replacement part for newer model insinkerators
Perfect update for the old nasty collar on my disposer.  The old one got stained and gross. This just pops in place of the old one.  It does cause water to drain a little more slowly but definitely makes the disposer more quiet.  Cost was a bit cheaper then Home Depot.  I believe this only works on the newer model in sink erators with the removable collar.  Older models had the rubber fins sort of built in and you had to drop the disposer from the sink drain to remove.  This one just pops in with your finger, very easy.