Fresh water fill on 209

Barrettkatz

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Joined
Aug 17, 2010
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Location
Peconic NY
209, new to me.
Has a fresh water fill system, 10 gallon capacity.
I can find the fill site; as I try to fill it, seems I get nowhere.
Is there a drain site that needs to be plugged for this, that I am missing?
Thx guys, and pity my ignornance.
B