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Old 27-12-2009, 07:28   #1
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Best Way to Cap Off a Thru-Hull

I have an extra above the waterline thru hull. Trying to get some ideas as to the best way to cap it off safely. It is low enough to take on water on a port tack. Also, it is not threaded but a barb t hull fitting.
Thanks,
Erika
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Old 27-12-2009, 07:55   #2
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if you don't want to fill the hole which is the best way if you'll never use it again, i would go to the chandler and get a replacement with threaded end on it and cap that with a threaded cap
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Old 27-12-2009, 08:17   #3
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I'm anal about holes in the boat, if there's no plan to use it I would fill it.
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Old 27-12-2009, 09:06   #4
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I donít like having any thru-hull that I cant close with a valve....but if thatís what you've got then a short piece of hose to a nipple with a barb on one end and threads on the other, then a cap might do it.
If youíre really trying to do it on a budget then a normal nipple threaded both ends may work.
Even cheaper may be a short piece of hose and then a solid round piece of some sort of plastic.
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Old 27-12-2009, 09:12   #5
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Quote:
Originally Posted by Ocean Girl View Post
I have an extra above the waterline thru hull. Trying to get some ideas as to the best way to cap it off safely. It is low enough to take on water on a port tack. Also, it is not threaded but a barb t hull fitting.
Thanks,
Erika

The other thing that comes to mind is to use it.
Add another vent to a holding tank. A extra cockpit or locker drain. Another water tank vent, etc. But if none of those will work, just put a teak plug in it with some clamps till the next haul out, then remove it and glass it in.
Bob
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Old 27-12-2009, 09:40   #6
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Sorry, I didn't mention size, It is 1 1/2, above waterline, port side aft quarter. I will use it for another bilge pump outlet in the future. Do you guys think a seacock is nec for an above the waterline offshore sailboat? I like the idea of using a short piece of hose with a threaded barb...
Thanks all!
Erika
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Old 27-12-2009, 10:33   #7
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Where do you consider your waterline when heeled.
Technically it will be under water...but the reality is if there’s a problem you may be able to just tack or stop sailing all together until you can make whatever repair is necessary.
Its easy for me to be anal about seacocks,,, but reality is if its above the waterline when at rest it may not be so critical.
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Old 27-12-2009, 11:02   #8
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Hose with barb fitting and broze cap will be as safe as if it is in use....
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Old 27-12-2009, 11:05   #9
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If you plan on using it any time soon...a valve with a pipe cap on the end. If you do not plan on using it anytime soon, then a pipe cap. If you never plan on using it then remove the whole thing and put in a fiberglass patch the next time you are hauled out.
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Old 27-12-2009, 13:25   #10
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On a monohull can you count on any thru-hull to stay above the waterline? If you cap it with the hose setup just make sure it can't get knocked off if someting slams against it.
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Old 27-12-2009, 13:48   #11
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Quote:
Originally Posted by Ocean Girl View Post
Sorry, I didn't mention size, It is 1 1/2, above waterline, port side aft quarter. I will use it for another bilge pump outlet in the future. Do you guys think a seacock is nec for an above the waterline offshore sailboat? I like the idea of using a short piece of hose with a threaded barb...
Thanks all!
Erika
Seacock isn't absolutely necessary, but its a nice feeling to know that you can close off any holes in your boat if needed. Since its above the waterline you could replace it with a thru-hull/seacock now and screw a plug in til you want to use it, assuming you are going to be using a bilge pump with a 1 1/2" hose - that's a pretty massive bilge pump.
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Old 27-12-2009, 14:59   #12
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Yep Randy, that is what I am worried about. After the feedback, I think when I haul out I will reinforce the area and add bronze t hulls. Only prob is the PO made two 1 1/2 holes close to each other so... it wont be a straight forward fix to add seacocks (but what is on a boat!!). I'll post a pic when that project is getting near. Right now I think I will do a short piece of hose with thread/barb fitting and keep the area free of heavy objects that could damage my jury rig.
Thanks for the input,
Erika

Thermal, Hmm I will re measure the diameter, it just might be 1 1/4 which would make more sense. I was upside down with a pair of old calipers, yeah, I'll blame it on the old calipers
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