You’ll find all the components and replacement parts you need for your bike at Escapa.
The Shimano 4-Port Connector Empalme-B (Di2 spec.) EW-JC304 is a hub for the internal routing of the EW-SD300 Steps/DI2 E-TUBE thin cable used in the EP8 drivetrain system
TECHNICAL SPECIFICATIONS:
Shimano Motor: Shimano E6100, Shimano Steps E5000, Shimano Steps E7000 (e-MTB), Shimano Steps EP8
Drive system: Shimano motor
Compatibility: Shimano EW-SD300 cable