Scroll up 7 posts to the pictures of the cap itself. Yes, it has an air vent drilled.
The golf ball system should work too, but occasionally you'll need to wash away saltcreep or it will glue solid and vaporlock your skimmer. My cap has done that a few times over the past year or so, so I try to clean it at least monthly.
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Marc Levenson - member of DFWMAS
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