George
iwire ---
I believe what you are saying is:
If a manufacturer produces a non-weatherproof recept with pigtails on it, you must allow it to be used where a weatherproof receptacle is required.
The generator, is the pigtail, of the non-weatherproof recept in the current question.
I disagree, the generator is UL listed as entire assembly like an appliance.
A "non-weatherproof recept with pigtails on it" would only be listed as a small part of a whole, a component of a larger assembly.
The listing for the receptacle you describe would require it to be an enclosure.
IMO it is not the same.
Bob