First Stage

When the first stage is not connected to a cylinder valve, the Auto Closure Device (ACD) keeps the inlet shut to protect the first stage internal parts from contamination and corrosive water.

Preserves the internal lubrication

Keeps the inlet filter clean and dry

Safer for elevated percentages of oxygen

Exceptional cold-water performance is achieved by modernizing Aqua Lung's three anti-freeze properties:

Where there's no moisture, there's no ice: The LEG3ND's integrated dry chamber keeps inner components clean and dry by isolating them from the outside environment

Deep ribs create a large heat exchange surface area that helps to prevent ice from forming on the mechanism (+30% vs Glacia / +70% vs Legend-2)

The new over-molded cap delays ice forming over the external diaphragm

Auto-Balanced (also known as Over-Balanced)

Progressive increase of the working pressure to maintain optimum breathing efforts: Depending on the diver's depth, the working pressure of the first stage is automatically elevated to counteract the increased breathing air density

Ergonomically shaped DIN and YOKE screws made of a bi-material “Soft Grip” surface provide a better hold when installing or removing the first stage – especially with cold hands

Channeled YOKE screw to prevent water retention.

Specialized ACD Dust cap attached to the regulator body to protect the inlet fitting and the ACD system from impacts or damage

Perfectly positioned HP and MP ports to provide optimal hose routing

Second Stage

New front cover opening channels allow water to flow sideways over the diaphragm

Radial openings to prevent free flows when diving in stronger currents

Openings widened to reduce peak inspiratory flow by an impressive 20%

New over-molded exhaust cover made of elastomer with a “soft touch” effect

Overmolded air purge

The wide surface area makes regulator purging easier

Purge depth controller optimizes airflow with minimal effort

A patented Comfobite mouthpiece reduces jaw fatigue and secures the second stage more comfortably.

A detachable and reusable mouthpiece clamp allows a quick and simple tool-free mouthpiece change without plastic waste.

The enlarged heat exchanger helps to prevent freezing of the second stage mechanism

Air channel deflector

Directs the airflow evenly during the inhalation phase

A streamlined bi-material deflector lowers the exhalation effort

Flexible and lightweight Aqua Flex hose with dual protectors