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 size of thru-hull parts		  New Topic  Topic Locked
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cmckitrick
Navigator

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USA
119 Posts
Initially Posted - 05/28/2004 :  14:09:34  Show Profile
After everyone's helpful advice and some research I think I have it straight on replacing the gate valves in my '81 C 25. Now I wonder if anyone can tell me what size thru-hull and sea cocks are needed. The hoses all seem to be 1/2". Do people generaly go with the high priced bronze sea cock? Is it advisable to replace all three thru hulls with a mushroom fitting and a sea cock? Thanks.
Charlie McKitrick
Norwell, MA
Valiant Lady... for now
'81 C 25 SR/FK
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Mark Maxwell
Captain

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USA
329 Posts
Response Posted - 05/28/2004 :  14:44:49  Show Profile
I went with the mushroom head for the galley drain and a flush mount for the forward drain because of it's proximity to the trailer pad. I didn't want it to interfere. As far as brass or marelon (sp) either one is strong. I used the brass because the mushroom head had a lower profile and the cost was only $1 more. I think in salt water there may be an advantage for one over. Someone else may have an answer for you there.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 05/28/2004 :  20:23:21  Show Profile
"Is it advisable to replace all three
thru hulls with a mushroom fitting and a sea cock? Thanks."

If they are currently the old 'volcano' to-hull style, IMHO, yes.

I found that a small angle grinder (4" to 5") makes short work of the volcano(s).

Wear a dust mask and have a shopvac sucking the dust/debris out and it's not too bad.
You will need an appropriately sized holesaw to make the new openings for your thru-hulls.
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Bill Holcomb
Admiral

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USA
769 Posts
Response Posted - 05/30/2004 :  09:07:04  Show Profile
You're right. The thru hulls should be 1/2".

Bill Holcomb - C25 Snickerdoodle #4839
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 05/30/2004 :  11:03:29  Show Profile  Visit Douglas's Homepage
If your in the water 24 / 7 and in a marina with power you may want Marilon through hulls. No common grounding system required. If your on a trailer its your choice. The bronze through hulls have less chance of a fracture if inadvertently placed on a pad of the tailer or bumped when loading. If you use bronze in a marina and one of your neighbors is thoughtless enough to have an automotive type battery charger running or a cord in the water bronze can be a problem . I prefer bronze and a sacraficial zink. Even a cheap clip in fish zink will do fine. Do you need to wire all the through hulls together ? Depends on how bad or old your marina is and if its salt or fresh. Salt being worse . Oh and dont forget those small zinks for the engine too.
Edited by - Douglas on 05/30/2004 11:05:27
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 05/30/2004 :  11:34:46  Show Profile
For what it's worth the to-hulls on my 1981 (#2428) were 1/2" for the head and 3/4" for the galley and replaced them with same dimensions when changed to thru-hulls.
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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.