Monoprice 8P8C RJ45 Cat5e Inline Coupler, White - Monoprice.com
Amazon.com: VizGiz 2 Pack RJ45 Waterproof Coupler CAT6/CAT5E/CAT5 Female to Female Adapter Weatherproof Connector Cover Plug Extension Cable Joiner Ethernet Signal LAN IP68 for Outdoor LED Equipment CCTV Camera : Electronics
Amazon.com: 2× RJ45 Coupler with Extra Shielding– Network Cable Connector & Ethernet Cable Extender (Two RJ45 Jacks, Easy Way to Connect/Extend Ethernet Cables, CAT 6A for up to 10Gbit/s, Black) – by
Ethernet Cable Joiner - dust and waterproof to IP68 - EDN