Xlab x nut inflator holder an excellent way to hold your xlab co2 cartridges and xlab nanoflator or speed chuck attaches to xlab carbon wing and super wing systems makes inflating tires a snap during training rides or out on the race course holds up to two xlab co2 cartridges made in the usa mounting hardware included inflation kit ready for speedy repairs holds 2 co2s and inflator permits more room in bags stores items in an aerodynamic positionbuy xlab accessories from chain reaction cycle