Seems the vent line being a larger inside diameter it would take an aweful lot of water to form a vaccum strong enough to suck the water around the loop. More water than could get in at one time - unless it went UNDER the water - then you got lots of other issues!
All I know is I've heard others say it and my V21 has a big ol loop in it above the vent. Factory I assume since the vent hose is pretty old and decrepid looking.
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1994 Wellcraft V21
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