LC duplex MM/SM keyed coupler is used to connect multimode or single-mode LC duplex fiber cables. Each coupler is color coded for identification and features a mechanical key, preventing users from accidentally connecting the wrong fiber cable. The non-flanged design is perfect for high density patch cables. These couplers utilize a ceramic sleeve suitable for both multimode and single-mode applications. Available in 12 different colors/keys, IT professionals will easily be able to provide network segmentation and security to fiber connections.