Product review (5 stars): Easiest Install Ever!
Once I figured out that both rubber rings and both metal rings had to go on the adapter...and to put away supplied sink ring and threaded extension...this was the quickest and easiest install ever!

The figuring out took two minutes...just enough time to finish my coffee!

Since I really wasn't looking forward to tearing out the installed ISE three-bolt flange...I could not be happier!