Vertical one-piece outlet box for siding. Save time and money with Arlington's cost-effective, one-piece outlet boxes. They are the fast, neat way to install a single-gang device on any siding type-without the need for extra pieces. F8091 boxes install before or after the siding and come with a pre-installed extra-duty, weatherproof cover. For added security they are lockable too. When installing on existing siding the flanges hide the cut ends of siding.