ok...the MAFS has one side that is round, which should easily work with a silicone piping adapter, and the other side, which should be "upstream" is rectangular, and should require a special adapter...i have highlighted the parts in the drawing included.
did you touch any of the inside parts of the MAFS? does the screen and center element look ok?
[IMG]local://upfiles/2745/9BAFD264294C43AC80C45EA1433F7248.jpg[/IMG]