Shaxon"s Duplex LC to LC Fiber Optic Keystone feed through coupler is an ideal way to join two duplex LC fiber optic cables. Fiber Optic feed through couplers snap into a wall plate, surface mount box or keystone patch panel to provide a junction point for backbone/horizontal network fiber optic cabling pre-terminated with duplex LC connectors. Keystone style jacks are designed to snap into any standard keystone port with no tools required.