Aqua Lung Air source 3 with Quick Disconnect The second stage valve is pneumatically balanced resulting in unparalleled performance and consistent breathing from start of dive to end. Ideal for use with over-balanced first stages The Trim Grip" in the middle of the corrugated hose allows diver to dump air from BC during ascent without removing the Air source from the mouth Using a clever bayonet mount, the Air source quickly and easily separates from the BC at the Trim Grip". This allows the Air source to remain with the diver's complete regulator for packing and travelling Uses a sturdy, yet comfortable Comfo-bite mouthpiece The inflator hose has been upgraded to a braided hose which is lighter weight and more pliable