Shimano ew jc200 e tube 2 port junctionthe ew jc200 allows user customisation of their di2 wiring across all of the e tube systems it features a female to female junction box that allows connection of 2 wires to extend their length this is necessary when working with bigger frames or for complex routing of add on shifters features for extension purpose femalefemalea 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shim