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Shimano e tube di2 junction box the shimano di2 sm jc41 internal junction box is the grand central station of the e tube di2 system'. '.strtoupper('a')ll of the component and battery wires meet here before running out to their respective components'. '.strtoupper('a')ll of the wires that connect to the junction box use the same connector to make assembly that much easier.featuressm 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.this junction box is only made to be mounted internally on frames specially designed for an internally routed system.a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.