Ergonomically designed to be the world’s most comfortable second stage, the B2 is the next generation of the highly acclaimed Atomic Aquatics B1 regulator. The B1 regulators have received more accolades from the diving press and independent test reviews than any other regulator in history for both performance and ergonomics. The B2 shares the identical first and second stage design and performance as the T1, the most notable difference being the metal (titanium) used in the T1. The B2 matches the industry's only all-titanium second stage with a compact high performance first stage of chrome plated brass and type 316 stainless steel. The second stage is so light in your mouth it almost floats. High performance breathing: High performance (low inhalation efforts at deep depths and high breathing rates) yet delivers the air naturally and comfortably. Nitrox ready: Factory ready for Nitrox to 40%. Compact first stage design: Features 5-port low-pressure swivel and exclusive "Jet Seat" piston design. All titanium second stage construction: The industry’s only second stage featuring all-titanium construction for the ultimate in corrosion resistance and light in weight to eliminate jaw fatigue. Impact-resistant two tone second stage housing: Available in 3 colors; gray, blue and yellow. Exclusive Atomic Aquatics "Comfort Swivel" second stage hose: The only second stage swivel of its’ type that allows unidirectional movement without any loss of performance. This swivel articulates at the slightest movement to eliminate any binding or pulling of the second stage hose in the mouth. Constructed of polished 316 stainless steel. Seat Saving Orifice: Exclusive patented Atomic Aquatics feature prolongs the second stage seat life indefinitely, eliminating aggravating leaks and degradations in performance. AFC: (Automatic flow control) Exclusive patented Atomic Aquatics feature automatically adjusts airflow at depth to maintain stable, comfortable breathing. Dual Silicone Comfort Fit Mouthpiece: Extremely soft and supple silicone rubber with tear resistant bite tabs. 2 year/300 Dive service interval: Corrosion resistant materials and maintenance saving designs extend the customary annual service period to 2 years. Limited lifetime warranty not contingent upon annual servicing.