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 Size of thru hulls/to hulls		  New Topic  Topic Locked
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cmckitrick
Navigator

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USA
119 Posts
Initially Posted - 04/29/2008 :  13:09:08  Show Profile
Hi Everyone. As far as I can see the original thru hulls or to hulls are 1/2" but I notice Catalina Direct only sells 3/4" and that size seems more common. When I replace them is it advisable to make them 3/4"? I am just wondering. I want to put mushroom fittings and sea-cocks. Thanks.
Charlie McKitrick
Norwell, MA
Valiant Lady... for now
'81 C 25 SR/FK
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Happy D
Admiral

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921 Posts
Response Posted - 04/29/2008 :  17:56:14  Show Profile
Hi Charlie,
Are you talking about [url="http://www.catalinadirect.com/index.cfm?fuseaction=product.display&Product_ID=183"]these?[/url]
Putting one of these through the hull and then screwing a ball valve on it is not exactly the recommended way to do it. A [url="http://www.boatus.com/boattech/casey/07.htm"]true sea cock, or through hull[/url] will have a flange that is bolted to the hull with the valve incorporated into it. Threaded connections are used from there on.
I used [url="http://farm4.static.flickr.com/3292/2452418501_496dfa084b.jpg?v=0"]Marelon through hulls from Forespar.[/url] They are bullet proof and non-corrosive. There are provisions to bolt these to the hull also and that is what I did. Of course you can always buy [url="http://store.hamiltonmarine.com/prodimg/CNN-78.JPG"]bronze[/url] and use the appropriate mushroom head. The correct mushroom head will have strait threads.
Dan
Edited by - Happy D on 04/29/2008 17:57:14
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 04/29/2008 :  19:24:33  Show Profile
New technology, new ways. Glass reinforced nylon or marlon - both are fine. High density plastics provide the opportunity to separate the functions of through hull and proper valve without the risk of corrosion at the metal to metal joint. The only downside is a little more drag from the mushroom compared to a flush throughhull.
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cmckitrick
Navigator

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USA
119 Posts
Response Posted - 05/05/2008 :  07:43:22  Show Profile
Thanks, guys. What I had in mind is a true sea cock or thru hull. What I am not sure about is the sizes involved. It looks like on the Catalina they are all 1/2" but that size does not see as common. I wonder if that means I should go to 3/4'? Not sure.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.