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Old 11-07-2017, 09:29 AM   #1
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2 1/2" thru hull to cork hole

have clean 2 1/2" hole in hull where tducer popped out
thru hull with pipe plug or cap should band aid
real sea cock would do it, but $$, space, and basic weakness....
ideas welcome
thanks
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Old 11-07-2017, 10:50 AM   #2
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I have safely capped thru-hull fittings with a pipe cap and filling with epoxy putty.

If your hole measures 2-1/2", you may not get a good fit with standard thru-hull fittings. A nominal 2-1/2" thru-hull will measure about 2-5/8 OD. A 2" thru-hull will measure about 2-3/8" OD. Epoxy on a backing block with the correct size hole might solve the fit problem.

Be sure to cut the thru-hull to the minimum length needed. The longer it is, the easier it is to break.

An actually fiberglass repair is the best way to deal with a hole you don't plan to use again. This is a good video showing the correct way to repair a hole in the hull.
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Old 11-07-2017, 12:21 PM   #3
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First preference would be to fiberglass it closed. Second choice would be to enlarge the hole slightly to fit the larger through hull properly. Clean the new through hull and fill it with thickened epoxy. Install it and then cap it and seal the threads with either epoxy or 5200.
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Old 11-07-2017, 12:44 PM   #4
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Thank you. The transducer measures 2 1/2" , the hole is a bit larger.
I can't measure the hole until I get the ducer out. I have it soaking in Kroil as I wait for a third hand and look for a c-clamp to get the big nut on the inside. I will be the big nut under the boat!
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Old 11-08-2017, 10:38 AM   #5
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Quote:
An actually fiberglass repair is the best way to deal with a hole you don't plan to use again. This is a good video showing the correct way to repair a hole in the hull.
That is certainly one way to repair a hole.
I was always taught to do a similar process, however I put the small patch against the hole and work outward to the large patch.
It works because I have patched thru hulls many times and none of them have ever breeched.
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Old 11-08-2017, 11:00 AM   #6
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Quote:
Originally Posted by jleonard View Post
That is certainly one way to repair a hole.
I was always taught to do a similar process, however I put the small patch against the hole and work outward to the large patch.
It works because I have patched thru hulls many times and none of them have ever breeched.
I agree, small patch goes on first. The video was confusing on that issue.
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