Premier Cable 4 Port Micro-C NMEA2000 Backbone 

NMEA2000 4 Port Connector Backbone Cable Tee

N2K Multiport Tee Connector For Ships Yacht 

NMEA2000 4 Port T Connector M12 Thread For Ships Yacht 

4 Port N2K Multiport T Connector can be used to expand or create a NMEA200 backbone.

When you doing your NMEA200 networks with this 4 Port Micro-C Tee Connector,  Drop cables are needed to connect your devices, Premier Cable also make and sell NMEA2000 Drop cables from 0.5m to 10 meters

Premier Cable 4 Port Micro-C NMEA2000 Backbone Suitable for NMEA 2000 certified, for Lowrance Networks, for Simrad Networks, for B&G Networks, for Navico Networks, for Garmin Networks

NMEA 2000 multiport tee connector is especially designed to an for NMEA 2000 backbone systems serve, and proper termination of an for NMEA 2000 network. N2K 4 port tee connector is engineered with 5 pin, IP67 waterproof for durability and reliability, stable performance and high efficiency.