There is no such thing. You cannot convert 120V to 240V (or 115V to 230V .... it is not 125 / 250) in a pigtail format. To get 240V out of 120V you would have to use a step-up or isolation transformer. $500 to $1200+ for a marine use model (and I expect a lot of them need much more than 30A). What I described to you is exactly what you asked for, except of course the '250' volt thing, which as I said does not exist.
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