The Shimano Di2 E-Tube FD-R9150 Plug Cover is a small but important accessory designed to protect your Di2 front derailleur’s E-Tube port from dirt, moisture, and abrasion when it’s not in use. Di2 electrical connectors are engineered for reliable signal and power transfer, but exposed ports can attract contaminants that degrade performance over time. This plug cover helps keep the port clean and sealed, preserving dependable electronic shifting function and extending the life of your drivetrain’s wiring interface.

Made to Shimano’s exact specifications, the plug cover fits the FD-R9150 Di2 front derailleur port snugly to block out grime and moisture without interfering with the body or mounting hardware. Its compact, low-profile design stays out of the way during riding and maintenance, and it’s easy to install or remove by hand. Whether you’re storing your bike, swapping components, or setting up a Di2 system with unused ports, this plug cover is a smart detail that helps keep your electrical connections in top condition.