The 4 port Junction is required for connection of several componnts into the system with EW-SD300 wires. EW-JC304 E-tube cable junction for Internal EW-SD300 wire routing.
The Shimano Non-Series Di2 Di2 EW-JC304 SD300 4 Port Junction product would be ideal for users requiring a compact, high-quality, and affordable Di2 junction box for direct mount or internal use in their cycling setup.
