Umarex 88 Gram Co2 Saver Adapter Airjavelin/fusion. The adapter threads into the air filter of the rifle then "fits" over the air hose allowing the user to adjust the PSI (PSI: the pressure in the air gun) the airflow direction and the amount of gas allowed simply the right amount of gas flow. The red and green color combination is easy to see on the eyepiece of the adapter and the connector is strong and tight ensuring a solid attachment. Made of aluminum and with a steel body with black anodized coating. Requires one CO2 tank sold separately. Specifications for Umarex 88 Gram Co2 Saver Adapter Airjavelin/fusion 2: Manufacturer: Umarex Fabric/Material: Aluminum Package Contents: Umarex 88 Gram Co2 Saver Adapter Airjavelin/fusion