The Powerline is the time-proven airway that has been powering Aqua Lung BCs over the years. Increased Fill Rate One of the Highest Air Flows in the Industry Environmentally Sealed Unit, Less Maintenance Integrated-Hose Clips for Attachment of LP Hose Streamline and Low Profile Cable Activated Rapid Exhaust, Simply Pull-Down on Lower Unit to Dump Air Dust Cap Cover for QD Nipple Fits All Current Aqua Lung BCD&';s