RiteAV - 2RU Recessed Rack AdapterThe 2U Recessed Rack Adapters are used to mount computer, A V, and or networking equipment slightly deeper in an equipment rack (3 inches from the face of the rack), allowing the ability to close rack doors when protruding wiring or equipment would have otherwise prevented doing so. These are perfect for mounting in patch panels, shelves, and other standard 19 equipment.