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 Catalina/Capri 25/250 Sailor's Forums
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 Thru hull replacement
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Initially Posted - 10/04/2022 :  04:19:48  Show Profile  Reply with Quote
Can anyone point me in the direction of a how-to on replacing the early “volcano” thru hull with a proper one??
I just bought the boat and want to do this while it it on dry land!!

1977 Catalina 25
Standard rig, swing keel

Outer Banks, North Carolina

Steve Milby
Past Commodore

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5843 Posts

Response Posted - 10/04/2022 :  05:58:53  Show Profile  Reply with Quote
In essence, you remove the old to hull valve and pipe, grind the volcano flat and install a new bronze pipe and ball valve.

Here's a link. Scroll down to "To" hull pipe vs. Thru-Hull Fitting.

Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore
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Master Marine Consultant

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5221 Posts

Response Posted - 10/07/2022 :  21:55:43  Show Profile  Reply with Quote
Catalina Direct also offers several plastic parts that can work for decades.
The actual through-hull mushroom piece
And the seacock ball valve

Note about hose clamps:
1. Always use stainless steel clamps. Test them out using a small magnet or your navigational compass. It they’re at all magnetic, then they are NOT SS.
2. Always use two in tandem, because when one fails, you’ll have a backup clamp.

Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT

Edited by - Voyager on 10/08/2022 05:34:34
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