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that is correct and the cause of my concern. because those ribs are the same height as the boss around the 1st hole, those ribs make the 2nd hole in the filter extension sits above the recessed area next to the rib. and that recessed area is where the leak would occur and is also where that squiggly groove leads to. theres nothing to block that second hole and the recessed area opens up to the squiggly groove





The squiggly groove is not a suction point so whats it going to do that concerns you so much ???

It doesn't really matter anyway since to already ordered a new one correct ?