i3 Buoyancy Control System: Conveniently mounted on the bottom left side of our BCs the i3 Buoyancy Control System is an exciting new BC technology from Aqua Lung® that has made our diving simpler, easier, more comfortable and more fun. The i3 is simple and easy to use. We push the i3 lever up to inflate our BC or down to deflate our BC. Special i3 Buoyancy Control System Features Safe: The i3 allows us to easily control of our diving. Mastering buoyancy control is one of the most difficult skills for a diver to learn. The i3 not only makes the skill easier but eliminates potential out-of-control-ascents caused by a diver reaching for the wrong air release valve. The i3 also allows for rapid location and activation of the BC inflator to establish buoyancy at the surface in case of an emergency. Easy: The i3 is simple and intuitive. Push the lever up to inflate our BC; down to deflate our BC. Convenient: Unlike other BC inflators at the end of a floppy hose, the i3 never moves. It is always at the same location where your left hand normally rests. It is always in the right place at the right time. Reliable: The i3 does not utilize pneumatics or hydraulics to activate the air release valves. Therefore, there is no possibility of failure due to leaks. Using push-rod technology, as found in aircraft, the design remains simple and robust. Fun: The i3 is just plain fun to use. Hidden Oral Inflator: All other BCs have a large hose dangling on the left front of the BC for inflation/deflation. The i3 System eliminates this hose, but if there is no air left in your air tank to inflate the BC the hidden pull down oral inflator can be used.