Black Surface Mount Box for E-40, E-50. The VE-3x5 adds vandal and weather resistance, as well as versatility to the E-40 Series entry phones. The VE-3x5 backboxes are black powder painted steel, weather resistant boxes designed to be surface mounted to a wall, post, or single gang box. The VE-3x5 is designed to be used with the E-40 Series entry phones and is also compatible with EWP versions of the E-40 Series entry phones. Applications Surface mounting the Viking E-40 Features Mounts to a standard single gang box Mounts directly to the wall.