Features
- 4-port junction box for internally wired Di2 e-Tube set-ups; integrates the ported wires
- Can connect e-Tube wires from: front and rear Di2 derailleurs, cockpit junction, battery
- Sit inside lower downtube/BB area on most frame designs
- Composite material; sealed
- Color: Black
- Weight: 5 grams
- Shimano part # ISMJC41