Through-Hulls - Page 3 - SailNet Community
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post #21 of 54 Old 01-04-2014
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Re: Through-Hulls

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Originally Posted by Watercolor View Post

I'd love to get a sense as to what purpose thru-bolts serve?
They prevent the thru hull from turning.

The nut on the mushroom is not a very solid attachment, although used by many manufacturers. Also a valve on a mushroom alone has mis-matched threads, straight on the mushroom and tapered on most valves.

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post #22 of 54 Old 01-04-2014
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Re: Through-Hulls

Re through-hull failure and bungs vs. putty or foam plugs: yachting monthly did a little test and they found that the most effective thing to stop up a broken seacock was... a carrot. Or a potato.
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post #23 of 54 Old 01-05-2014
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Re: Through-Hulls

I am removing all thru-hull fittings that also have seacocks. Here is an example (first picture I've tried posting; hope it shows below) of the current installation. Notice that the thru-hull fitting is mounted on the outer hull. The hull lining and core material are cleaned out. This does not seem like a correct installation. I plan to fill in the core and glass it to make the hole flush with the inner hull surface. Then I will mount the thru-hull as described by others in this thread. Is this an "uncommon" installation? I wonder if Beneteau mounted in this manner or if this is an after market installation?


Last edited by gbgreen59; 01-05-2014 at 06:05 PM.
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post #24 of 54 Old 01-05-2014
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Re: Through-Hulls

The picture looks blank. Can anyone provide advice about posting pictures? I tried copying a link from Flikr.
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post #25 of 54 Old 01-05-2014
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Re: Through-Hulls

I found that the picture will show if you click on the title of the window in my post above.
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post #26 of 54 Old 01-05-2014
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Re: Through-Hulls

Questions:

1. If you look in the hole, does the thru-hull nut sit on the hull or a backing plate?

2. Is the nut on the barbed fitting metric by chance?

3. What are those two bolt heads for, they look like carriage bolts?

4. What does this valve service?
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post #27 of 54 Old 01-05-2014
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Re: Through-Hulls

Thanks for helping on this Watercolor. Here is the same shot but of the entire photo. Here are answers to your questions...

1. Inside the hole below the liner and core materieal, a bronze washer sits on the inside of the hull and a bronze nut sits on the washer. The nut is threaded on the thru-hull. Then the valve sites on top of all that.
2. The nut is quite large. A 1 1/8 wrench fits it. Although, the nut could not be reached with a wrench on the two thru-hulls in this location, since they are recessed below the liner and core.
3. Good question on the carriage bolts. I know they don't go to the outside of the hull. On the other hand, I can't tell you what they attach. I will investigate.
4. This location is under the Galley sink. This particular thu-hull intakes water from outside the boat. There is one for drain that can't be seen in this photo. In the photo below, you can see the electric and manual water pumps.

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post #28 of 54 Old 01-05-2014
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Re: Through-Hulls

Here is a little video that might also be helpful to see what I'm talking about. This location is in the head.

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post #29 of 54 Old 01-05-2014
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Re: Through-Hulls

Here is the better picture you posted below. That is not a seacock, just a valve installed on a through hull.



This is a proper seacock:




Ideally you would enlarge the hole in the liner and install either a proper seacock as shown or install a flanged adaptor like this with a valve on it.


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Last edited by mitiempo; 01-05-2014 at 08:10 PM.
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post #30 of 54 Old 01-05-2014
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Re: Through-Hulls

Yes, thanks for the picture Brian. I am replacing all the thru-hull valves on my boat with the type shown in your picture. Thanks. I think my first job is to fill in the cut-out and bring it back flush with the surface.

I removed all 5 thru-hulls over the weekend.

I wonder if Beneteau made this installation or if this was an after market install?

Last edited by gbgreen59; 01-05-2014 at 08:12 PM.
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