Venting the tank inside the boat makes a lot more sense than venting it externally. Putting a freshwater tank vent on the hull is just asking for contamination, especially if you dip the rails when sailing.
Venting them to a fixture mounted above the galley sink makes sense so that any water that does come out drains out the sink.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.