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post #11 of 29 Old 11-26-2018
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Re: Thru Hulls 1989 Catalina 30

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Y the argument over the names of corrosion resistant Cu alloys is still semantics.
OK, I'll try one last time. If you think it's just semantics, read this article from Professional Boatbuilder Magazine ... "Beware the Brass"

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post #12 of 29 Old 11-26-2018
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Re: Thru Hulls 1989 Catalina 30

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My first boat would have ruined that record. I have one being held in by caulking.

But the point is valid and I don't understand why people replace valves "just because"
Per the Catalina Direct 30 site (https://www.catalinadirect.com/index...ball-valve.cfm) immediate replacement of the bronze nipples and “garden variety gate valves” used in early Catalinas is in the “must do” category. Their suggested replacements are plastic.

IMHO, metal underwater is to be avoided where possible and practical. I don’t care whether it is brass or bronze or stainless because you are dealing with an electrolyte and the potential for stray currents in addition to the potential for dissimilar metals, leading to galvanic corrosion. Sometimes you can’t avoid metals, like for prop shafts, and sometimes the metal solution is superior, like for most props, but you do have a choice when it comes to standard thru-hulls and seacocks.
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post #13 of 29 Old 11-26-2018
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Re: Thru Hulls 1989 Catalina 30

How do these bronze of whatever type bronze they are... fail? Do they corrode away and lose so much strength that they break apart? If so wouldn't there be tell tale signs before it went critical?

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Re: Thru Hulls 1989 Catalina 30

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How do these bronze of whatever type bronze they are... fail? Do they corrode away and lose so much strength that they break apart? If so wouldn't there be tell tale signs before it went critical?
Manganese bronze typically contains 35 - 38% zinc, it dezincifies with anything more than their natural voltage potential and can waste away just like your zinc anodes.

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Re: Thru Hulls 1989 Catalina 30

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Manganese bronze typically contains 35 - 38% zinc, it dezincifies with anything more than their natural voltage potential and can waste away just like your zinc anodes.
So if it appears completely intact with no sign of corrosion it would be fine.... Is this correct?

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Re: Thru Hulls 1989 Catalina 30

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So if it appears completely intact with no sign of corrosion it would be fine.... Is this correct?
Not necessarily, the corrosion can be in the threads which you can't see.
Take a look at this article from Paul Stevens

Mainesail also has an article on this issue that you may wish to search out.

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Last edited by boatpoker; 11-26-2018 at 11:29 AM.
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post #17 of 29 Old 11-26-2018
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Re: Thru Hulls 1989 Catalina 30

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Not necessarily, the corrosion can be in the threads which you can't see.
Take a look at this article from Paul Stevens

Mainesail also has an article on this issue that you may wish to search out.
Thanks for the link. I think I will change all mine next haul out... which will be a short haul next spring. Pro active maintenance.

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post #18 of 29 Old 11-26-2018
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Re: Thru Hulls 1989 Catalina 30

If in doubt about the fittings connecting to the ocean, just woop with a mallet every couple of years. That's more proactive maintenance than many boat owners give their maybe brass maybe bronze or is it plastic???thruhulls.
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Re: Thru Hulls 1989 Catalina 30

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I am considering replacing the thru-hulls and seacocks on this new to me Catalina.

Catalina Direct sells nylon replacements for a reasonable price.

Is this the best way to go?

Any info on products and/or installation is appreciated.
My first project on my Catalina 22 was to replace the 40-year-old factory glassed in gate-valve Notes on a thru-hull replacement

I upsized and went with the Groco bronze fittings. This was relatively expensive and complete overkill. If I had to do it over again I'd still go a size bigger, but I'd do Marelon instead of bronze.

The process seemed a bit daunting, especially as my first ever boat project, but I followed Mainsail's instructions and everything went great.
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Re: Thru Hulls 1989 Catalina 30

Out here in the primitive hinterland, metal recycle yards have bins of good enough ball valves of SS316 (pulp mills , boilers and breweries.) $1 /lb. Hard to worry about overkill .
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