umarex maintenance co2 patroner 5 stKeep your CO powered airsoft equipment performing at its best with valve maintenance capsules that combine CO with a special lubricating oil. Each capsule contains 0. 5g of oil that cleans and lubricates the valve mechanism, while providing a protective layer of oil to all moving parts. Regular use of these maintenance capsules ensures not only stable precision, but also reliable operation over time. By protecting and caring for the mechanism, you