Unión de 4 puertos Shimano Di2 EW-JC304

The Shimano Di2 EW-JC304 4-Port Junction is a compact routing hub for Di2 electronic groupsets, allowing you to connect up to four E-tube components through a single junction point. It's the practical solution for more complex Di2 installations — frames with internal routing, dual-sided shifter setups, or builds that simply need more connection points than a standard junction provides.

Clean, reliable, and fully compatible with Shimano's E-tube ecosystem, the EW-JC304 keeps your wiring organised without adding unnecessary bulk. Whether you're building up a new frameset or expanding an existing Di2 system, this junction does exactly what it needs to — nothing more, nothing less.