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Old 07-27-2008
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Groco Flange Adaptor?

Anyone use these? Essentially, it's a fitting that screws onto a standard NPS throughull, but it allows you then to screw on an NPT ball valve. It's supposedly a way to make a proper seacock setup without having to buy all new valves, which of course gets pricey. Our B49, like so many boats, comes with inline ball valves threaded right to the throughull, so there is no flange, there's a mismatch between the NPS and NPT threads, etc. One of my planned upgrades was to take out all the throughhulls and valves, and replace them all with Marelon seacocks. With the Groco adapter, however, I could do the project by "just" unscrewing the existing valves, gluing on a wood backing plate with the proper size hole cut in, cut the through hull pipe to size, screw on the flanged adaptor, screw that into the wood backing plate, then screw on the valve. No more labor intensive than swapping out the through hulls (quite a bit less actually), and the hardware cost would be substantially less (the adaptors seems to go for about $30 to $45 each, depending on size, as opposed to north of $100 for a flanged seacock).

Anyone have experience with this?
Dan Goldberg

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Old 07-27-2008
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Yes and they are GREAT !! If a valve goes bad, which they eventually will, simply un-thread it and thread another on. No disrupting the flange/backing block/thru-hull bedding material..!
-Maine Sail / CS-36T

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