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Old 09-11-2013
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Removing an old marine head?

My 1969 Yankee Dolphin has the original marine head that only dumps overboard. After fantasizing about retrofitting a holding tank, I have decided that it would be too much work for the resulting convenience and the type of sailing that I plan on doing (daysailing with the occasional overnight to Catalina). So, I have decided to remove the head entirely and replace it with a higher end porta-potty like this:
Amazon.com: Thetford 92853 Porta Potti 550P Portable Toilet: Automotive Amazon.com: Thetford 92853 Porta Potti 550P Portable Toilet: Automotive



Question: Is it possible to safely plug the two through-hulls without removing the actual valves (water intake and overboard dump) while the boat is in the water?
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Old 09-11-2013
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re: Removing an old marine head?

Plug them by simply closing the valve, then next haul out remove them

If you really feel you must drive a wooden plug into the hose to double plug it (Note I did not say a plug into the valve, that would be wrong).
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Old 09-11-2013
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re: Removing an old marine head?

Did you consider a flexible holding tank like a Nauta tank? Or a fairly small one like 5 gallons?

Otherwise what chuckles suggested sounds spot on to me. Close the seacock (tie of the handle so it can't open) cut the hose to a short length and plug it. That would feel pretty safe to me.
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Re: Removing an old marine head?

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Originally Posted by asdf38 View Post
Did you consider a flexible holding tank like a Nauta tank? Or a fairly small one like 5 gallons?

Otherwise what chuckles suggested sounds spot on to me. Close the seacock (tie of the handle so it can't open) cut the hose to a short length and plug it. That would feel pretty safe to me.
Yes, I have considered every way in which I would NOT have to remove the old head. However, for my intended use I would rather not have to drill another hole through the deck for the pump out and my below deck space is rather limited as it is. They say that everything that you do to a boat is a compromise of sorts, and this is one of them. Question #2: On haul out, what kind of job am I looking at to glass over the two through hulls?
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Re: Removing an old marine head?

I glassed over three thru hulls on my Catalina this past spring. I had removed the marine head too (and installed a composting toilet - - works GREAT, by the way). It's not too bad to do the "glass over".

I followed the instructions in the venerable classic book, This Old Boat,
This Old Boat, Second Edition: Completely Revised and Expanded: Don Casey: 9780071477949: Amazon.com: Books This Old Boat, Second Edition: Completely Revised and Expanded: Don Casey: 9780071477949: Amazon.com: Books



The short version - grind the hole out from the center in a radial pattern so that it is a largish dished out area. Then glass in many many layers of fiberglass. Then sand level and smooth. Add fairing compound as necessary to blend in.

It worked GREAT - super smooth - strong. works great.

Feel free to ask if you have ANY questions - glad to help.

PS - buy the book. It's like a bible of fixing old boat stuff. WAY VALUABLE RESOURCE.
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