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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/15/2007 :  15:23:46  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by John Bixby</i>
<br />Frank,
I changed my seacocks after reading the forum. Every one with an
older 25 like mine should.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">...and replace the "to-hull" pipes with mushroom-headed through-hulls. (Numerous threads in the archives on this.)
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/15/2007 :  19:58:52  Show Profile  Visit Frank Hopper's Homepage
Agreed John, you did a very smart thing. I am not sure what model year Catalina changed the through hull but My 82 had different through hulls, they and my 89's, and my Merit 25's all have through hulls that are flush on the out side but threaded on the inside. I believe they are these.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/15/2007 :  20:19:29  Show Profile
My '85 had flush thru-hulls similar to those. However, for retrofitting, I'd suggest the "mushroom" units that don't require a very precise job of mortising and tapering for the disk without cutting completely through the hull. With a mushroom, you just need a hole the diameter of the thru-hull neck. I suppose the mushroom might cost you .0001 knot on the racecourse......
Edited by - Dave Bristle on 11/15/2007 20:20:58
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/15/2007 :  20:33:10  Show Profile  Visit Frank Hopper's Homepage
My point is that the 85 in question already has these.
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redeye
Master Marine Consultant

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3476 Posts
Response Posted - 11/19/2007 :  14:08:17  Show Profile
Seacocks on a 1985 Catalina 25

Should I be worried about mine?

regards.ray
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/19/2007 :  20:28:31  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by redeye</i>
<br />Seacocks on a 1985 Catalina 25

Should I be worried about mine?<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">Catalina changed to proper thru-hulls and seacocks well before 1985. But anything below the waterline is worth some attention. Make sure you have two all-stainless hose clamps on every connection.
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Champipple
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USA
6855 Posts
Response Posted - 11/21/2007 :  08:12:45  Show Profile  Visit Champipple's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Dave Bristle</i>
<br />My '85 had flush thru-hulls similar to those. However, for retrofitting, I'd suggest the "mushroom" units that don't require a very precise job of mortising and tapering for the disk without cutting completely through the hull. With a mushroom, you just need a hole the diameter of the thru-hull neck. I suppose the mushroom might cost you .0001 knot on the racecourse......
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

We had the mushrooms on the Evelyn - but you glass/carbon fiber that area up and then countersink them - speed loss at that point becomes negligible. Work effort and cost increase though
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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.