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I could be wrong, but I think those fiberglass mesh pieces are supposed to go over the top of the vent pipe
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yes i thought that too before i removed the vent caps.
mine were from the factory with the screen underneath. i really don't think it matters that much as the big dollop of vulkem is what actually seals the vent.
the real issue is taking a look at them every 5 years or so and replacing the gasket/vulkem combination. if the screen is on top, that works as well!
john