Product Overview Upgrade your e-bike’s charging port security with this precision-engineered replacement cover. Specially designed to replace the original rubber component (Part Number: 21-16463), which is prone to insecure or unreliable closing, this cover provides a secure seal directly into the charging port without the need for additional hardware. Compatibility Brand/System: Engineered specifically for Cube E-Bikes equipped with Bosch drive systems. Confirmed Models: Fits Cube Reaction Hybrid Performance 650 and 100 models.