NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes Tough silver powdercoat finish

Tough silver powdercoat finish

Bleed valve for fine-tuning pressure

Tubes: included and installed

plus an extra-wide PolyX breaker

Features a portable telescoping design for easy packing and breakdown

NEW Shimano EW-JC304 Di2 Junction Box - 4 Ports, Use With EW-SD300 type_touring-bikes Tough silver powdercoat finishShimano Di2 Frame Junction Box Frame Junction Box connects via SD50 E tube wires to four different points: front derailleur, rear derailleur, cockpit junction box and battery mount All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e tubeproject. shimano. com