RJ45 Coupler In-Line Coupler Cat7/Cat6/Cat5e Ethernet Cable Extender Adapter Female to Female Black. RJ45 Female to Female Network Jack In-Line Coupler extend the length of a Ethernet patch cable. Constructed of high-impact, fire-retardant plastic and gold-plated contacts, these couplers meet or exceed Category 6 performance in compliance with the TIA/EIA 568-C.2 standard. Connectors: RJ45 8P8C, Gold Plating