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does drain hole cover works (is efficient)?
does water really enters standing area slower/less in dugout SUPs?
any experiences with NSP or Infinity dugouts?

I think the idea is that the design aids water draining from the deck, rather than it stopping water entering. It does it by creating a lower pressure area which sucks the water out of the dugout area when you are moving forwards. Well, that's the theory as it was explained to me, anyway.

Venturi drain.