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Old 03-08-2008
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Holding tank thruhull vent

I am replacing all of my sanitation hose. The 5/8 hose that vents the holding tank connects to a 5/8" thruhull vent. The vent is corroded so I have removed it and plan to replace it. The outside part of the vent was 90 degees and streamlined facing aft. The open end had a screen in it. I can't seem to find anything that is similar to this. Would a different type of vent work just as well?
Thank you
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Old 03-08-2008
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You probably want something like this...

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Old 03-08-2008
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As long as your replacing it

... you'll benefit to going to 1"...it will alow for more air transfer which will greatly reduce oders..

Could also use a Fuel tank hull vent, as they have the screen on them also..

Woops nevermind SD has it already.. Dawg-gon robo typer...

Last edited by Stillraining; 03-08-2008 at 09:27 PM.
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LOL...
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Old 03-09-2008
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I just put in a holding tank in my boat.
For the vent I just put in a white plastic .75 inch diameter through hull. No screen.

I put it on the side of the hull.
Sounds unusual, but here is my thinking..

I wanted the extra diameter (1 inch dia is probably even better) to fight smells in the holding tank.

I routed the hose uphill inside the hull before it went downhill to the holding tank. This is to keep rain from filling up the holding tank.

I put the hole in the holding tank as far inboard as I could, so that if I burried the rail in the water, it still wouldn't fill the tank.

So, you're good. With the hole on the side, it is out of the way, and large.

gh
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Old 03-09-2008
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GH-

You'll probably regret not having a screen on the vent. Wasps and other critters will more than happily take up residence in the nice dark space you've provided. clearing them out will not be fun.
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Old 03-09-2008
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Thanks for all your advice. I ordered the one similar to the one "Sailing Dog" suggested. I would like to go to 1" but I already have all the new hose, new tank, etc. Lots to do.
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Old 03-09-2008
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The down side of the screens is that if the tank fills up. Any... well we'll call it debri will clog up the screen and eventually keep the tank from venting properly With a straight through hull if it does become clogged you can use a water hose to clear the obstruction. you also eliminate a 90* turn at the fitting. They put screens in fuel vents as (flame arrestors?) Don't know the proper term but I bet BF does.
Put a rag in it when you store the boat.
Works for me. may not work for every one especially if there is no room to get the hose higher than the vent.
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Old 03-16-2008
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Where did you order your new tank, and does it have a bottom discharge, or is it a top discharge with a tube inside.
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Old 03-16-2008
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Here is a company that is easy to work with.

Ronco Marine Holding Tanks
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