Originally Posted by caltexflanc
This is what I used; it protects while the cord is plugged in. Beside wharever water protection, it prevents somebody or something knocking into the plug.
That's the one. You can also get one for a horizontally mounted box.
I remember looking at a model home in a new development once and as I walked up the front steps the first thing I noticed was one of these mounted upside down (with the cord holes on top)!