Just FYI: My deformed gasket did not leak to the outside. It was deformed on the inside, causing the drag on valve movement.That one on amazon is not perfectly square. It has those indents, not sure if it is the best choice, but maybe it will work just fine.
I AM ALL MIXED UP WITH MYSELF. There is a large group of us who question those things that don't make sense. Although membership in the organization is voluntary and not recorded, the initiation procedure is imposed unwittingly. Although not virtually impossible, working on your motorhome is kind of like doing your own taxes. Any acquired nomenclature is contradictory and open to interpretation, if even applicable. When calling Customer Support, expect forty different answers from the fifty representatives the phone dialog transfers you through to get one who cares.