Automatic flow control, Exclusive Atomic feature automatically adjusts airflow at depth to maintain stable, comfortable breathing. ; Exclusive Atomic feature prolongs the second stage seat life indefinitely, eliminating aggravating leaks and degradations in performance. Front cover; New Anti – Surge is designed for use in high current situations to eliminate the possibility of free flow due to the swift moving water or strong currents. ; Large, balanced, flow through piston design for stable intermediate pressures and high performance at low tank pressures.