The PolyPhaser FCO-MPFSM1240-YLSP is a MPO female connector for 12 fiber single mode applications. The PolyPhaser FCO-MPFSM1240-YLSP is designed for use with a 4.0mm fiber diameter and comes with a yellow color designator to denote single mode usage. The PolyPhaser FCO-MPFSM1240-YLSP comes with a short boot for round fiber cables and is made with a familiar push-pull design for easy insertion and removal. Built to deliver lower insertion loss, PolyPhaser's MPO connectors will provide the dependability and performance required for the most demanding high-speed networks. Order online today!.