The connector is a 3" D.C. compression connector that fits EMT/IMC/RGS and is the older style without plastic gaskets.
Since the fitting is under the panel it would be at most an
occasional damp location. I was wondering if would be code compliant to use the die-cast fitting since it is placed so as to prevent moisture from entering. 314.15 only addresses wet locations as far as the U.L. listing requirement is concerned. BTW, The rigid is being used to thwart copper thieves and is overkill for conductor protection in this case.