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  #11  
Old 04-27-2007
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It depends on the design, size and location of the first vent. In many cases, like on the tank on my boat, one vent is fine. Also, larger tanks generally benefit more from a second vent, as they need the cross ventilation to properly air out the tank.
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  #12  
Old 04-27-2007
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It depends on the design and size of the tank and location of the first vent. In many cases, like on the tank on my boat, one vent is fine. Also, larger tanks generally benefit more from a second vent, as they need the cross ventilation to properly air out the tank.
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New England

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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Old 04-29-2007
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Quote:
Originally Posted by sailingdog
I believe the water intake was left off the drawing to simplify it... and not confuse the novice boat plumbers...

This setup with the modifications I've indicated is designed to allow flushing into the holding tank or directly overboard, as well as pumping out the tank via the pump used to flush the Lavac head, or via a deck pumpout fitting. It is also designed to only require one pumpout fitting or connection on the holding tank.
Then it's identical to mine. My only modification, which I may or may not pursue, is to use the Henderson as a manual sump pump for an as-yet-designed shower stall. I would have an electrical bilge pump as a matter of course, but I wouldn't want my "fail-safe" to be a bucket and sponge if the sump pump packed it in.
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I would like to improve the shower setup, on my new "old" boat, as well, but will probably wait and make sure the big stuff works OK first. The boat has a shower, but looks like it just drains to the bilge. There is only a 3/4 hole in the head area floor - which, I assume drains to the bilge. I like the idea of having a separate shower sump, but I don't like the idea of cutting an approx 8-10" square section out of the head "sole / floor" to let the waterdrian to it. I am not sure what a normal install would be, but I think it would be cutting / recessing, or building a mock/raised floor around it, which would then be tripped over constantly! Is there another way, I am missing?
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Northeaster-

Just fit a through hull to the 3/4" hole and put a hose on it, and then lead the hose to a shower sump unit mounted in the bilge compartment, somewhere below the level of the shower pan.
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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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