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 THRU HULLS?		  New Topic  Topic Locked
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patricksher
Deckhand

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USA
13 Posts
Initially Posted - 03/20/2017 :  08:43:31  Show Profile  Visit patricksher's Homepage
How many thru hulls are in a cat 25? The PO did some strange plumbing and I'd like to clean it up fro this season.

Stinkpotter
Master Marine Consultant

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Djibouti
9013 Posts
Response Posted - 03/20/2017 :  09:17:44  Show Profile
Generally two--one for the forward sink if you have one, and one for the galley sink and icebox drains. If you have a marine head, the forward one is also plumbed to draw water for flushing, which consternates people until they learn to plug the sink drain in order to get sufficient suction at the head.

What is your vintage? Older models (pre 1983 I believe) were built with what we here call "to-hulls" rather than thru-hulls. There's a hole the hull, and a bronze pipe is threaded into the fiberglass with a "mushroom" of resin around it on the inside of the hull, with a "gate valve." There's no bronze or marelon flange on the outside of the hull, either flush or mushroom-shaped. If you have these, replacing them with proper thru-hull fittings with ball-valves should be a priority.

(This question is an illustration of the value of a "signature" in your profile, so some basic information on your boat can appear automatically with every post. You see that with most regulars here, including mine below.)
Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired),
Now on Eastern 27 $+!nkp*+ Sarge
Edited by - Stinkpotter on 03/20/2017 09:21:23
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OLarryR
Master Marine Consultant

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USA
3367 Posts
Response Posted - 03/20/2017 :  09:24:38  Show Profile  Visit OLarryR's Homepage
Besides the drains, they may have a speed transducer and a depth finder transducer originally installed thru the hull under the VBerth area. Many have gone to in hull depth depth transducer using a toilet bowl wax ring glob when a replacement depth finder or fish finder may have been installed.
Larry
'89 Robin's Nest#5820, Potomac River/Quantico, Va
http://catalina25.homestead.com/olarryr.html
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Akenumber
Navigator

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USA
247 Posts
Response Posted - 03/29/2017 :  18:07:43  Show Profile
On our 84 we have two to hulls and a thru hull, for the holding tank dump. Also a transducer and speedo pickup.
Ken
San Diego
84 C25 SR/FK 4116
The KRAKEN
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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.