The ASCO 438 series of round cylinders are compliant with ISO 6431 standards, making them interchangeable with ISO 15552 cylinders when in the mounted condition, or equipped with an MP4 mount such as the one integrated in this series. The versatile 438 unit is operable with a number of mediums including filtered, lubricated and general air or inert gas. These cylinders are now replaced by the Aventics RPC series, however some spares are still available. Please contact us for residual spares enquiries.