MOS Insert, Duplex SC Fiber Adapter with Phosphor Bronze Sleeve, 1 unit high, Grey. For use with Multimode fiber. The innovative Multimedia Outlet System (MOS) consists of a surface-mount box and single- and dual-gang wallplates which accept a variety of copper, fiber, and A/V connectors. The system is ideal for multimedia applications in conference rooms, training rooms, classrooms, auditoriums, and other areas.