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As a backup reg the AIR2 delivers air as smoothly as most primary second stages. The flexible purge cover is large and easy to locate, allowing for quick clearing when it comes time to take a breath. In addition, a new dive/pre-dive switch lets you detune the AIR2 when it's not being used, eliminating free flows. And unlike traditional dangling octos, the AIR2 is always within easy reach if needed.
The company's upgrade from the original AIR2 is one of design - easier to handle and buttons that are much easier to push. It fits comfortably in the hand, and the large inflate and deflate buttons can be differentiated by both color and touch, improving safety on both ascents and descents. The power inflate button features a very light lever so it's easy to initiate inflation. Also, both inflate and deflate buttons are positioned on top of the housing, making them easier to operate when breathing off the unit without having to change hand positions.