Replacing seacoks + how to grind down old fiberglass around old gate valves. - Page 3 - SailNet Community

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Old 05-05-2011
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Lightbulb Sea Cocks

While some sailors will defend one make or material over another with near-religious fervor... I have installed bronze one-piece seacocks and the current Forespar one-piece Marlon seacocks and like them both.

If you worry much about electrolysis, then go with the Forespar.

Mitempo's advice is short and to the point.

We have frp backing plates and our Forespar valve bodies are epoxied in place, with the external lip ground off to give us a theoretical added nano-knot or two of speed...

So do a good strong install and sleep well at night.
Here is a pretty good thread link, with further links mentioned in reply #7.
(Lots of opinions, but educated and forthright...)
Thru hulls and ball valves - EY.o Information Exchange

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Old 05-05-2011
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I just finished reading several emails from the Catalina 30 group on Yahoo (which I belong to) about cracked Marelon seacocks. I have never heard of a good bronze seacock cracking. Especially in the smaller sizes (under 1") the Marelon are more fragile I think.
Living aboard in Victoria Harbour
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Old 05-09-2011
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I drilled out the old nipple with a hole saw sized for the new through hull, and lacking a good grinder, took out the "volvano" bit by bit with a plastic cutting attachment on my Dremel, and then used ~30 grit on my palm sander to smooth/rough up the job.
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