The ECS-3 provides a 5/8” diameter 
connector for some of Fluence brands LED fixtures using Threaded 
Waterproof  Connectors for interconnecting. Like the other ECS kits, the
 ECS-3 comes with a 16ft RJ12 cable, a T-splitter and a special 4 ft 
RJ12 / Threaded Waterproof  Connector cable.