Garmin Split Connector RJ45 Right Ang (010-11090-00)
Garmin Marine Network Adapter Cable Small Female to Large 0101253110 – DJ's Marine Electronics
Amazon.com: Marine Network Cable Rj45 (010-10551-00) 20ft with Split Connector and Waterproof Cap Fits for Garmin Navigation Screen Devices : Electronics
GetUSCart- Bonbo 010-10551-00 Marine Network Cable 20 Feet with Split Connector and Waterproof Cap Replacement for Marine RJ45 Compatible with Garmin Devices GMS 10 Cable
Garmin Support | Installing a Split Connector on Garmin Marine Cables - YouTube