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Capping unused thru hull?

Anything related to the operation of your boat. Steering, Bilge Pumps, thru-hulls, bottom paint, etc.
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Jab
Scurvy Dog
Scurvy Dog
Posts: 39
Joined: September 13th, 2013, 6:26 pm
Vessel Info: 1978 Santa Cruz 2866
Moosehead Lake, Maine

Capping unused thru hull?

Postby Jab » November 4th, 2013, 3:14 pm

Any practical advice for capping an unused thru hull fitting?

This particular fitting is plastic, straight, and does not have a ball-valve. It is the output for a macerator from head, where there is a valve to switch between macerator and pump-out.

I am going to remove the macerator and restore a single, pump-out connection. I don't want to leave a hidden potential leak.

The good news is this is easily accessible by removing the settee seats. I could easily leave all of the existing hoses in place and just cap the disconnected macerator hose in the head. I could remove the macerator and hose from the thru-hull barbs, and install a short, capped hose section. Is there a better, safer, more definitive option (short of removing the fitting entirely and patching the hole in the hull?)?

Open to suggestions.....

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Seif911
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Vessel Info: 1977 Carver Mariner 33'
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Re: Capping unused thru hull?

Postby Seif911 » November 6th, 2013, 8:48 am

Easy is sometimes best. I'd fill the thru-hull from the outside with silicon, much like we did for our whirlpool tub in our up north vacation home. Clear silicon, almost nobody will even know you did it and it is leak free. Of course, my thoughts are sometimes wildly different than other people.
Thanks,
Steve

22' Godfrey Hurricane Fun Deck, Fiberglass hull, 175 HP, Deck boat
24' Chrysler Cruiseliner III (Lonestar), 120 HP, Aluminum Hull, Cabin, 1968
33' Carver Mariner, fiberglass hull, 520 HP, Yacht, 1977
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waybomb
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Posts: 1963
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Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
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Re: Capping unused thru hull?

Postby waybomb » November 6th, 2013, 6:21 pm

Is the fitting below the waterline?
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft
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Topic author
Jab
Scurvy Dog
Scurvy Dog
Posts: 39
Joined: September 13th, 2013, 6:26 pm
Vessel Info: 1978 Santa Cruz 2866
Moosehead Lake, Maine

Re: Capping unused thru hull?

Postby Jab » November 6th, 2013, 7:24 pm

Just above.
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United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 1963
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glaspar / 1969 Johnson Electrmatic 85
1964 Barron Flat bottom drag boat
A couple of dinghies
Location: Saint Joseph and Trenton, MI
Has thanked: 41 times
Been thanked: 283 times

Re: Capping unused thru hull?

Postby waybomb » November 6th, 2013, 7:46 pm

With that knowledge, I would attach aa long enough house that could be secured well above the water line, the plug that hose with a stainless house barb with a threaded cap on the end. Double opposed house clamps at both end.
Thanks
Fred
1964 Barron Flatbottom with BBC Chevy
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572s
http://s4.beta.photobucket.com/user/waybomb/library/
Past - 1988 2807, 1989 4207 Aft

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