When you took dive lessons you learned to perform specific skills to make you safe and comfortable underwater and at the surface. One of those skills was buoyancy control. Once you start diving for fun you use your buoyancy control device constantly throughout the dive. Your octopus or alternate air source device on the other hand is never used unless there is an emergency out of air situation. Reacting properly in an out of air situation can make the difference between a safe dive and a tragedy. If your alternate air source and your BCD inflator device are one and the same, you will always know where to find it in an emergency. The 5th generation of the Air 2 by Scubapro is a second stage regulator and balanced inflator in a single, compact housing. The Air 2 - 5th Generation builds upon an already superior product. It is lightweight, streamline, and eliminates the need for a backup-regulator. The Air 2's air-balanced power inflator valve means you'll have a steady stream of air, regardless of the pressure in your tank. The Air 2 - 5th Generation leaves you breathing- easy throughout your dives. The Air 2 has a fixed Venturi Initiated Vacuum Assist (VIVA) Flow Vane for safe and uncomplicated use now has a dive/pre-dive switch. This switch allows the regulator mechanism to be set more like that of a standard second stage regulator. The Air 2 - 5th Generation breathes like a dream, rivaling some primary second stage models. It is CE-certified for waters 50-degree F (1