10 Pieces RJ45 Coupler, Ethernet Extension Adapter Network Connector for Cat7/Cat6/Cat5e/Cat5 Ethernet Network Cable Coupler Female to Female (Blue): Amazon.co.uk: Business, Industry & Science
rhinocables Cat5e RJ45 Coupler, Female to Female Ethernet Coupler and Joiner for Internet Cable Leads, Cat5 Ethernet Connector to Join Cables, Beige (10 Pack) : Amazon.co.uk: Business, Industry & Science
8P8C Female to Female IP67 RJ45 Waterproof Outdoor Cat5 Cable