worked for Hubbell for 21 years.... There is no standard specifying what constitutes marine grade, so, the difference could simply be the label. The GFCI, despite being a safety device, is built offshore to a price, driven that way by the residential construction market. The marine variant might be upgraded in some basic ways (visible plating) or might not, and this will vary by manufacturer. Years ago, manufacturers built better stuff and did not focus so much on standardization and cost. To be fair, most customers are not willing to pay for better, when good enough will do. GFCIs have provision to protect downstream devices, but they must be wired accordingly. The GFCI first, and the downstream receptacles connected to the purpose-specific terminals on that GFCI. Note that this means that the cumulative ground leakage for the downstream portion are now "seen" by the GFCI, and "nuisance tripping" could be a result. Are you worried about safety or compliance? I think the biggest safety issue is not in the head but somewhere else, probably when working on the boat. (how often do you use 110v appliances concurrent with the presence of standing water in the head? At home sure, but in the boat? In two years I have never used the receptacle in the head. ) IMO to do this right, install a GFCI receptacle or module as far upstream as possible, but after the 15A branch circuit breaker (in the 33ii there are two circuits, port and starboard, I think.) protecting as a priority the receptacles where you are most likely to be using 120v - fans, tools. . One thing to check, and I don't know the answer, is whether or not you are protected on circuits energized by an inverter. GFCIs don't or at least didn't always work without a real ground reference. (Gensets as an example - years ago this created a great deal of confusion WRT workplace safety practices.) Dave
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