StarTech MPO Loopback Plug, Single Mode 9/125 MPO-8 Male Fiber Loopback Adapter, MPO/MTP Loopback Test Plug MPO Male Loopback Tester - MPO/MTP Male Single Mode 9/125um fiber loopback test plug; Male MPO-8 connector for testing MPO patch panels and QSFP transceivers; 8-fiber configuration with APC-polished ends; Low Insertion Loss; IEC and RoHS compliant