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post #5 of Old 06-05-2012
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Re: Head holding tank vent line - 1981 E37 Plan 'B'

Originally Posted by wrbanwal View Post
I like the idea of two vent lines.

with the holding tank in the v-berth, my only real option to go up is to go forward. I just wonder what effect that will have those few times I bury the nose in the water. Is that going to fill my undersized 12gal holding tank?
Put a little clamshell cowl on it, with the opening facing aft and down a bit. If you bury the bow you should be moving forward fast enough to keep water from overcoming the Venturi effect.

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