Shimano EW-AD305 SD300 to SD50 Conversion Adapter

Shimano EW-AD305 SD300 to SD50 Conversion Adapter The EW-AD305 SD300 to SD50 Conversion Adapter allows the older Shimano Di2 SD50 E-Tube wires to be connected to the newer; slimmer EW-SD300 wires. It provides a secure and reliable connection that is stable and water-resistant.