Product review (5 stars): Easy to install, fits perfectly and it works.
Easy to install, fits perfectly and it works.  You do need a little bit of extra pushing to get it around the corners, and you do need to look carefully so that you don't put it in backwards, but just look at the old one before you take it out, and work it in with your fingers.  It would be nice to have some guidance as to how much to leave loose as you begin to install.  I looped it in half and held it in the center of the top so that I could tell where to start; you cannot move it after the install.  The old one gives some indication, but if it is deteriorated, that's not reliable, nor is the new one necessarily identical.

I didn't realize how bad my old seal was until it started flaking apart.  No leaks at all with this installed.