It's a junction box
"Great price and good delivery. Did what it supposed to do"
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Shimano Non-Series Di2 EW-JC304 SD300 4 port junction
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£27.99
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- EW-JC304 E-tube cable junction for internal EW-SD300 wire routing
- The 4 port Junction is required for connection of several componnts into the system with EW-SD300 wires
- To be positioned neatly inside frame tubing when connected
- Cables sold separately
- Reliable and secure water resistant connectors
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Overall rating: 5.0 / 5 from 2 reviews.
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Need to have for double
"Need to have for double wired STI shifter firmware upgrade. Good quality."