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Old 23-09-2008, 22:59   #1
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Thru-Hull Cap

As part of removing my holding tank I have a length of hose connected to the discharge thru-hull. I now want to remove this very stinky hose and cap the thru-hull until I haul out and eventually close off the thru-hull completely.

I'm browsing the www.Groco.net site and not seeing anything intended to be used as a cap neccessarily. I searched around and didn't find anything in the forums. now I'm thinking the best idea is to use a clean length of hose, cap it and then attach that hose to the closed thru-hull with 2 clamps on through hull and the plugged ends of course.

Is there a better alternative?

Thanks,
-p
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Old 24-09-2008, 04:29   #2
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Sounds like a plan to me. I personally don't care for holes in the hull, but since you've got one already sitting there (albeit decommissioned), you might just let it be for a while just in case the need arises someday for a new through-hull. At least you won't need to cut a new one. Of course, if the need hasn't arisen after a period of time, then glass it over permanently.
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Old 24-09-2008, 05:01   #3
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PVC threaded plugs in the seacock, works a treat.

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Old 24-09-2008, 05:26   #4
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Thru-Hull fittings generally have un-tapered NPS (straight) male threads, whereas Seacocks (valves) generally have NPT (tapered) female threads.
The cap or plug you select will have to match the mating fitting.

See the mainecruising Seacock Primer,
specifically
“Mismatched Threads”:
Seacock & Thru-Hull Primer/Pre Information Photo Gallery by Maine Sailing at pbase.com

and:
American National Pipe - NPT/NPS:
American National Pipe - NPT/NPS | Pipe and Hose
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Old 24-09-2008, 09:25   #5
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Begs the question of why you would want to remove a holding tank at a time when more and more people are wanting to have them fitted.
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Old 24-09-2008, 10:49   #6
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Thanks Gord and Joli. I'll check my threading and look for that screw plug.

As to why I'm pulling out the tank. I am putting in a composting head,
more on that here: S/V Deep Playa - Pearson 424 : We're looking for the trash fence

Thanks again for the help!
-p
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Old 26-09-2008, 21:43   #7
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I found a bronze cap and I was working towards getting it in but my seacock leaked enough that I decided to haul out. I'm hanging I'm the sling tonight. Everything is ready to go back together. My only question is do I need something on the threads (like plumbers tape for nautical fittings) or do I just thread it on tight and I'm good?

Thanks!
-P
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Old 26-09-2008, 21:45   #8
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Put a little teflon tape on it.
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Old 27-09-2008, 00:42   #9
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Thanks again !
I go back in the water in the morning.

I was very happy (and surprised) I was able to get the 20+ year old 90 degree bend off the seacock, but with a nice large pipe wrench and some elbow grease it came off pretty easily. Hardly any swearing at all! :-)

-p
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