Shimano Dura Ace 9070 Di2 EW90 Junction Box - EW90-A - 3-Port - Drop Handlebar

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The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts. This junction A is required to connect the shifters via E-tube wires to the down tube junction wire, 5 Port design specifically for TT setup and 3 port design specifically for drop handlebars.