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Discussion Starter · #1 ·
After months of forced isolation very far away from our boat, we came back and found a poor looking through hull for our sink/freezer drain. The boat is an Oceanis 41, 7 years old, and sat at the dock, with a galvanic isolator. Anodes have been changed regularly and bottom cleaned by a diver this winter. Inspected most other seacocks and they look normal with no deposits or coloration (like the one on the left).

1) how bad is this? Do we need to drop everything until this is resolved? And miss our only week of cruising this year?
2) what is the likely cause? Leak, corrosion, galvanic problem? Is this a surface issue and the sea cock should be functional?
3) it seems that Beneteau uses duplex brass, which is problematic. I can't fix that, so reminding me that their quality can be questionable is not particularly helpful, but it seems like something we want to address in the next haul out.
4) what is the best way to clean this up? So I can inspect the actual fitting underneath? What products/Substances/tools?
5) any other help and comments are welcome, as this is a new problem for me.

thanks!

136619
 

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Discussion Starter · #4 ·
Thank you. So white is salt (Small leak), green is verdigris (ok) and pink is bad (zinc from the brass being eaten away). I’ll look carefully for the pink as I clean it. I won’t mess with a fitting below the waterline, so finding someone to look into it will be fun.

does it seem that the problem is on the valve, the t fitting or the hose/clamps, or the through hull? no way to know for sure?
 

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Discussion Starter · #6 ·
From the picture, it looks like the problem is the T fitting where it goes into the valve, and possibly where it connects to the horizontal hose (and maybe the hose above that, which is out of the picture).
Thanks for everyone's help. I got the lead mechanic here to inspect it and the valve is indeed mostly fine and the T Joint is shot. His recommendation is to keep it shut and replace both ASAP with the boat out of the water. Apparently Beneteau uses loctite on these joints and he does not recommend trying to remove it on the water. Keeping that valve open at the dock is what caused this, the t joint is brass and susceptible to corrosion and electrolysis.
 
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