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dasreboot
Admiral

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803 Posts
Initially Posted - 12/10/2014 :  11:14:40  Show Profile  Visit dasreboot's Homepage
any reason I cannot use one seacock for both the head intake and sink drain? thinking about retiring the forward seacock.
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redeye
Master Marine Consultant

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3474 Posts
Response Posted - 12/10/2014 :  11:33:17  Show Profile
The head intake needs to be close to the head, otherwise it becomes difficult to prime.
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dasreboot
Admiral

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803 Posts
Response Posted - 12/10/2014 :  16:15:36  Show Profile  Visit dasreboot's Homepage
well that's a good reason.
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awetmore
Master Marine Consultant

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USA
1144 Posts
Response Posted - 12/10/2014 :  20:06:57  Show Profile
The head intake and sink drain did share a single through hull on my Catalina 25 (1984 model). That's how the boat was rigged from the factory, you can see it in the parts manual.
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Stinkpotter
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Djibouti
9013 Posts
Response Posted - 12/10/2014 :  20:43:15  Show Profile
The solution with one through-hull is to plug the sink drain when you're not using it. Then the head should draw.

But if you're in salt water, I'll suggest considering plumbing the head to your fresh water supply. Along with an enzyme treatment, it virtually eliminates the sulfurous odors.
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dasreboot
Admiral

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803 Posts
Response Posted - 12/11/2014 :  04:37:14  Show Profile  Visit dasreboot's Homepage
was planning to use fresh water. was thinking of plumbing a backup just in case. but of course if things get that dire, I could just fill the head with a bucket.

I think I'll just close up the forward thru hull.
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ct95949
Captain

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Aruba
300 Posts
Response Posted - 12/11/2014 :  20:39:55  Show Profile
I've never used my fresh water tank for drinking water but if you do I wouldn't plumb it to the head. That would definitely qualify as a cross connection. My '79 had a shared line with the sink drain and worked well by closing an in-line hose valve below the sink before pumping the head. Sometimes I would prime the line by pumping fresh water into the sink with the valve open. In that case you would have an air gap, the best protection against a cross connection. I like having a dedicated head intake on my '90.
Edited by - ct95949 on 12/11/2014 20:48:58
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.