I mostly work on boats (well, did before the depression) and I got this a lot. "I want an outside lighter" (I call it a mousehole). My response after the first few disasters was "No, you don't."
Those power connections could qualify as a complete POS, but there are too many pieces missing.
What you what to do is find a place that is inside and protected, but easily accessed. No mater what quality receptacle you put outside, it might last the first season if you are lucky. Boats wouldn't even finish the season. Use wire that is as heavy as you can manage and put a set of binding posts (see radshck 274-550) at the end. Connect the mousehole to that. Then when the plug and receptacle screw up, you can just tie onto the binding posts.
Matt