The Flight Attendant Reservoir Upgrade kit converts specific non-Flight Attendant rear shocks into a Flight Attendant-capable unit. Includes all necessary parts to convert RockShox Vivid Air D1+ rear shocks into a Flight Attendant-capable unitKit Includes: Flight Attendant Reservoir, Module, Battery, USB-C Charger W/O cord, Service Kit, Oil, Grease, 31mm Flat WrenchCompatible with RockShox Model: RS-VIVD-ULT-D1 RockShox Flight Attendant Rear Shock Reservoir Upgrade Kit Rear Shock Part UPC: 710845930034 MPN: 00.4318.117.002