What is it? Pictures.

That is not a 30 amp pattern even though it appears that way in photos. It is a smaller pattern. Do some marinas have a 20 amp locking receptacle? MM

I don't know, I have not seen one but they may, usually if they have 15/20a service, it's a standard plug.
I guess I didn't make myself clear last night when I said your shore power cord was bigger...sorry
 
No, I think you are saying it correct. The plug is rated to 20 A, but it fits in the 30 A shore power socket. It's up to you not to overload it. Then again, to try to force 30 Amps down a standard extension cord would probably be a pretty dumb thing to do, hence the reason it's only rated to 20A.

Thanks again Scott and ditto to your last statement.
 
20A 125V 1P twist-lock male cord end coupled to a 15A/20A 125V 1P straight blade "T" slot female cord end.The "T" on the energized side accomodates both 15A & 20A cords.
Prudence required that the fusing or breakers upstream are no greater than your cord or equipment are rated for.
GFCI breaker or mechanism upstream will reduce the risks but around water some folks will "find a way" to make something work that really shouldn't be used.
Years ago residential owners would replace a fuse a few times & then tire of it. Next fuse was bigger & would hold. Problem was the outlet & wiring were not rated & overloads occurred.
 
Like I said earlier (and the configuration may not be exactly the same as what has been shown here), the rag boaters have an adapter that plugs into the 30 amp outlets so their 110 cords can lay in the water and make the marina hotter than hell smiley-vault-character-042.gif
 

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