SM-JC41
SHIMANO - Junction B - E-TUBE - Internal DI2 Wire Routing - 4-Port

For internal DI2 wire routing, SHIMANO's SM-JC41 Junction B is the central connector for DI2 systems. Wires from the front and rear derailleurs, cockpit area, and battery all plug into the 4-port SM-JC41 junction, which is housed inside the bike frame.
* For internal wire routing

MODEL NO: SM-JC41
SERIES: DURA-ACE 9070 Series
Average weight: 4.1
E-tube port (pcs): 4
Specification: 4 connectors type of junction
E-tube connector (pcs): 0
Type: Built-in type
SD300 connector (pcs): 0
SD300 port (pcs): 0
SD50 connector (pcs): 0
SD50 port (pcs): 4