Tri-BackUp series is a complete modular system in which Topeak has carefully integrated storage, hydration and repair into one solution for triathletes The Tri-BackUp Air Station is an adapter for mounting a CO2 inflator, CO2 cartridges, and a mini pump neatly behind the seat Requires the use of Tri-Backup Elite , Pro V, or Pro I systems to mount to seat Compatible with Topeak`s Rocket Series pumps and Topeak inflator Air Station BlackUPC/EAN/GTIN: 883466011847