I wouldn't remove it unless you have cutting out or running on issues.
I've noticed on some of the later ones they don't have the outer O ring but a gasket, if you undo these you will need a new gasket or an outer O ring and guess what the gaskets are not listed on service box!
I've noticed on some of the later ones they don't have the outer O ring but a gasket, if you undo these you will need a new gasket or an outer O ring and guess what the gaskets are not listed on service box!