For internal DI2 wire routing, Shimano's SM-JC41 Junction B is the central connector for DI2 systems. We aim to provide you with the best service possible.
Shimano SM-JC41 Junction Box B E-tube Di2 Electric Wire Cable Connector.
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Shimano SM-JC41 Junction B 4-way connector block for EW-SD50 Di2 Electric Wires
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