SM-JC41 cable junction for internal wire routing. Junction is required for connection of rear mech, front mech, battery, and cable to battery indicator junction box. To be positioned neatly inside frame tubing when connected. Cables sold separately. Reliable and secure water resistant connectors. For use with Dura Ace 9070 and Ultegra 6770 Di2 groupsets plus the new Ultegra 6870 Di2 groupset  .