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To Hull / Through Hull

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Bruce Baker
Captain

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USA
402 Posts

Initially Posted - 01/10/2003 : 08:42:49

There has been some discussion about "to hulls" and "through hulls". What's the difference? What are the concerns about each?

Thanks,
Bruce Baker

Edited by - on

OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 01/10/2003 : 11:21:16

Briefly, a to-hull is glassed to the inside of the hull - which can become lose and sink your boat. The thru-hull goes through the hull and is held in with a nut on the back side - much, much more secure.
See prior posts for discussion adnauseam . . .

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Champipple
Master Marine Consultant

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USA
6855 Posts

Response Posted - 01/10/2003 : 11:25:56

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
There has been some discussion about "to hulls" and "through hulls". What's the difference? What are the concerns about each?

Thanks,
Bruce Baker
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Through hulls go through the hull and have a piece that attaches on either side that screws down and locks tight. They come in a variety of flavors...plastic, bronze, stainless etc. From this fitting you can attach a seacock and or hose.

<img src="http://www.sailnet.com/store/prodimage/160x160/for906010.gif" border=0>

<img src="http://www.sailnet.com/store/prodimage/160x160/abi1714.gif" border=0>

With To hulls, the hose attaches to a pipe which goes directly to the hull. The fiberglass is built up in this area and you may here the member referring to them as volcanoes or mountains...see below (I think this is a picture of Douglas' repair

<img src="http://im1.shutterfly.com/procserv/47b2dd35b3127cce9ca14d9e7ffe0000004410" border=0>

The main concern is that over time the to hulls will work loose and give way. This would cause numerous gallons of water per minute to flood your cabin and sink your boat. Which, in almost 99% of the cases, this is not good.

There has been much discussion about this, check the archives. The occurence of failure is rare. Obviously, the couple of members that have had it happen are big proponents of replacing them. It was however up to code when the boat was built.

I had an appraiser look at the Wasp this past March/april and I specifically asked him what he thought. In his professional opinion, they didn't need to be replaced, however, they should be inspected annually. But he also noted that we are not in an area where running aground is a very common occurence. (which can also bang up the fittings)

He felt that we should be more concerned with the "Gate Valves" that look like the garden spigots which were no longer code in new boats as well as ensuring that you have 2 hoseclamps for any hose under the waterline. (incidently, his biggest concern was the crappy old AC fuse box for the shore power which was really not up to snuff but was completely acceptable back in 78 when the boat was built)

By the way also want to limit putting items in those lockers that are going to bang around and cause undo stress on the "volcanos".

As for concerns about the Through Hull....If you have to have a hole in your hull, this is what I would install.

Which is better, A through Hull....Do you have to run out and change them before you go sailing....NO...BUT YOU SHOULD INSPECT THEM ANNUALLY.

dw

D. Wolff - "The Flying Wasp" #401 sr/sk
Chief Measurer C-25/250 National Assn.
<img src="http://www.flags.com/dreamimages/Flags/measurer.jpg" border=0>

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 01/10/2003 : 13:22:38

Bruce,

Click on this link and then select "Seacocks" to go to an explanation on the "To/Thru Hull" issue. The link also has information on converting to internal halyards.

http://home.attbi.com/~c25sailor/projects.html

Don Lucier, 'North Star'
C25 SR/FK
Cradled on the hard, 200ft from Lake Erie

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 01/10/2003 : 16:58:09

If you have the old volcano shaped to hull and have a chance to replace them do it. If you are in a region where you get good winter freezes then thats an even more reason to change them. <img src="http://im1.shutterfly.com/procserv/47b2dd35b3127cce9ca14dbdfeed0000005410" border=0>To Hull / Through Hull<img src="http://im1.shutterfly.com/procserv/47b2dd00b3127cce9d5f16f68cc30000005410" border=0><img src="http://im1.shutterfly.com/procserv/47b2dd00b3127cce9d5f160f0d0a0000005410" border=0><img src="http://im1.shutterfly.com/procserv/47b2dd00b3127cce9d5f16fa8ccf0000005410" border=0>

Doug&Ruth
Triska (Alberg 29)
Tacoma Wa.

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