Exceptional quality gear at an incredible packaged price. Afford to dive. 1st Balance Piston 1st Stage Delivers exceptional performance Delivers consistent, maximum airflow at virtually any pressure level and any diving depth A unique flow-through piston design ensures optimum flow, even under hard and deep diving conditions Fewer moving parts simplify service, maintenance and tuning A low-pressure port swivel assembly provides versatile positioning of 2nd stage, octopus, inflation hoses, and 2 high-pressure ports allow up" or "down" tank valve mounting Advantage: reliable, easy breathing, high performance 2nd External air intake resistance adjustment system Internal air deflector for smooth and easy breathing Lightweight and compact Weights a mere 7 oz without the hose Light weight helps prevent jaw fatigue during those long dives Large diameter exhaust valve allows for proper removal of exhaled air