Aeris Atmos Nitrox DVT Balanced Pro Regulator 1st and 2nd Stage for Scuba Diving (reg38) Aeris quality, Exceeds all expectations, Top of the line quality regulator with a low price, FIRST STAGE SPECIFICATIONS: Nitrox (EAN) compatible from the factory up to 40%, Pneumatically balanced valve that maintains preferred breathing thoughout your dive, Set the valve once and the ATMOS Pro automatically adjusts to make breathing as easy at 100 feet as it is at 30 feet - with no additional manual adjustment, First stage has environmental seal to keep out sand, salt, and other contaminants and prevent freezing inside the regulator during cold water dives, Precision machining results in unmatched breathing performance, Made from an ABS/Polycarbonate composite blend of materials for durability, 2 high pressure ports, 4 low pressure ports, Weighs 27 ounces, SECOND STAGE SPECIFICATIONS: Pneumatic Balancing System for easier breathing, Demand Valve Type, Nitrox Compatibility standard to 40%, Lightweight, weighs only 5.4 ounces (without hose), Nearly neutrally bouyant underwater which reduces jaw fatigue, Patented Orthodontic Mouthpiece to further reduce jaw fatigue, "Diver Adjustable" inhalation, Venturi Switch - The adjustable deflector vane found in the ATMOS Pro diverts airflow from the valve directly to the mouthpiece, producing smooth venturi-assisted inhalation, Pre-dive/dive switch to prevent unwanted freeflow, Integrated Purge Button, 2 year limited warranty, FREE lifetime replacement on service parts for both first and second stages (if serviced annually), FULL MANUFACTURERS WARRANTY!!! AERIS stands behind everyone one of their products with fantastic customer service!!!