Now in a new 5th generation version, the Air 2 is not only an extraordinary BC inflator, but the work-of-breathing has been dramatically improved, providing the same, smooth breathing performance as a downstream second stage regulator
 
Classic Downstream Valve
Dive/Pre-Dive Switch for adjustable VIVA
Improved design, control and safety for BC inflating
Larger deflation button and high-comfort mouthpiece
CE certified EN250 (A> 10°C warm water test controls) as a second stage regulator
Can be assembled on any Scubapro BCD