Product review (5 stars): Seriously I needed this replacement!
have to give this 5 stars just for the fact of it making me find how much  disgusting junk was hiding under the old flappy rubber piece which was originally there.  i didn't have to cut out the old one to install this but another reviewer mentioned it and i found a thick ring of stinky sludge all around and under the old rubber piece. this unit slides in perfectly and seals just above where the one was so easily removable to clean. no more stinky sink! and more stable than the old one so should catch more foreign objects i don't want to grind up.