Shimano SM-EW90A JunctionA 3ports for Dura-Ace / Ultegra Di2
Junction kit for Shimano's Di2. It connects the time trial switches to the EW-SD50 wire kit. One additional port is used to connect to EW-SD50 wire kit, which then connects the battery-pack, front and rear derailleur. For external installation. Not compatible with Flight Deck.