The Umarex CO2 Adapter allows airgun shooters to use two 12 gram CO2 cartridges in place of one 88 gram tank on most 88 gram CO2 powered airguns, like the Umarex AirJavelin and 850 AirMagnum.
Specifications:

Type
Size	12 gram
Caliber
Capacity
Quantity	1
Finish	Silver
Material	Metal
Model or Style
Mount