We use the arlington products. Its the bomb weather proof cover and all come in one clean package and cheap to.MAkes a great finish not much outside check them out at arlington electrical fittings.No have no stock or nothing just great products.
The problem with "in use covers" is they are not in use most of the time and wasps love living in them. I also have dirt daubbers that lay eggs in the ground pin holes.
All receptacles in wet locations are supposed to be "in-use" covers as per 406.8(B). However I know in some parts of the northeast AHJ's will let you put the old WP covers on commercial buildings so as to prevent vandels from knocking them off or smashing them. As far as porches they are classified under 406.8(A).
