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Old 20-03-2016, 11:07   #1
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Join Date: Nov 2015
Location: Baltimore MD
Boat: Roberts Spray 33
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Thru-Hull Cap

I discovered on my steel hull boat that a previous owner used a metal transducer which corroded. Luckily corrosion didn't affect the hull just the tube welded to the hull. I'd like to cut this tube off and put a marelon thruhull in place until next year when I have the time to add a new sonar unit. I know thru hulls use NPSM not NPT threads.

Does anybody know where I can buy a cap for the thruhull with the proper threads? Or am I stuck with a seacock?
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Old 20-03-2016, 11:16   #2
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Re: Thru-Hull Cap

Hmmm, not sure, but You could put a cheap ball valve or etc on for now.
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