4-Port Polarization Insensitive Optical Circulator (12) Shenzhen Optic-Forest Co., Ltd. Base Info Model NO.:12Type:Single-mode FiberConnection Structure:FC-FCCertification:RoHS Description Pre:VGA Splitter 1 to 8 Ports 250MHz Next:Rvv/Rvvp/Rvsp Cable, Copper Conductor PVC Insulated PVC Sheathed (RVV-4503)