AT 400 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%

Pneumatically balanced, user-adjustable second stage. This pneumatically balanced, adjustable second stage is sure to provide you the highest performance for many years. The pneumatically balanced second stage provides the lowest possible inhalation effort. The second stage adjustment allows you to adjust your breathing effort, fine-tuning the regulator to your desired setting throughout your dive.

The venturi assist deflector vane directs airflow from the valve directly to the mouthpiece producing a smooth "venturi assisted" inhalation. Turning the venturi assist down, to a pre-dive position, prevents regulator free-flow while on the surface.

• Pneumatically balanced

• Diver-adjustable inhalation effort

• Adjustable venturi switch

• Nitrox compatible to 40%

• Paired with your choice of the new AT 400 Balanced Diaphragm First Stage featuring DVT (Dry Valve Technology) or our popular ATMOS Balanced Diaphragm First Stage

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.

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