Aeris Atmos Pro Regulators: Pneumatically balanced, user-adjustable second stage The venturi assist deflector vane directs airflow from the valve directly to the mouthpiece producing a smooth "venturi assisted" inhalation Nitrox compatible to 40% The environmentally sealed diaphragm ATMOS first stage 5 LP ports, 2 HP ports for maximum hose placement Swivel on primary LP port reduces jaw fatigue by allowing the diver to turn their head to any position without pulling on the 2nd stage Hose angles coming out of the 1st stage are designed to direct the hoses for low-drag positioning to the divers body