Lightweight, high performance second stage. The ATMOS Sport has many of the high-performance features of the ATMOS Pro with the exception of the 2nd stage adjustment knob and pneumatically balanced valve design . This regulator is ideal for the diver who wants high performance without having to manually adjust the 2nd stage while diving.

Conventional second stage without diver adjustment
Adjustable venturi switch
Nitrox compatible to 40%
Paired with your choice of the new AT400 Over-Balanced Diaphragm First Stage featuring DVT (Dry Valve Technology)

AT400 First Stage
High performance over-balanced diaphragm first stage with environmental seal and the added protection of DVT (Dry Valve Technology).

4 LP ports, 2 HP ports for maximum hose placement
DVT eliminates corrosion of critical internal components, bacteria, hose deterioration, and damaged gauges and computers.
Nitrox compatible to 40%

DVT (Dry Valve Technology)
A patented design that puts an end to flooded regulators without sacrificing performance! DVT is a revolutionary regulator technology designed to automatically prevent moisture and contaminants from entering your first stage, even if the dust cap is left off. Find out more

Adjustable venturi switch
The adjustable deflector vane found in the AT400 Sport diverts airflow from the valve directly to the mouthpiece, producing smooth venturi-assisted inhalation. With the addition of a user-adjustable venturi system, full adjustment control rests in the hands of the diver.

Computer optimized design
AERIS regulators are exclusively designed using the latest 3-D computer modeling techniques. This allows us the ability to model and test performance while still in the early stages of development. The AT400 Sport's unique deflector vane and housing design diverts airflow from the valve directly to the mouthpiece, producing smooth venturi-assisted inhalation.

Lightweight
The AT400 Sport's housing is made from an ABS/Polycarbonate composite blend of materials making the AT400 Sport both extremely rugged and lightweight (5.4 ounces) and nearly neutrally buoyant underwater, reducing jaw fatigue on extended dives. The extremely ligweight cover ring is machined from a solid piece of aircraft aluminum, and then hard anodized, utilizing a unique process to prevent corrosion.

Patented orthodontic mouthpiece
To further reduce jaw fatigue, the AT400 Sport features a patented Orthodontic Mouthpiece, designed to accommodate the natural overbite of the human jaw.

Nitrox Compatibility
The AT400 Sport is classified as being suitable for use with nitrox breathing gas mixtures containing up to 40% oxygen by volume without the need for special preparation, cleaning or component parts.