First degree:

When the first stage is not connected to the cylinder valve, the automatic closing device (ACD) keeps the inlet closed to keep the internal parts of the first stage from contamination and corrosive water.
- Maintains internal lubrication.
- Keeps the inlet filter clean and dry.
- Safer for elevated oxygen percentages.

Exceptional cold water performance is achieved by upgrading Aqua Lung's three anti-freeze properties:
- Deep fins create a large heat exchange surface, which helps prevent ice from forming on the mechanism.
- New molded cap slows down ice formation on the outer diaphragm.
- Progressive increase in working pressure to maintain optimal respiratory effort:
Depending on the depth of the diver, the working pressure of the first stage automatically increases to counteract the increased density of breathing air.
Perfectly positioned HP and MP ports ensure optimal hose routing.

Second degree:

New front hood opening channels allow water to flow laterally over the diaphragm.
- Radial openings to prevent free flow when diving in stronger currents.
- Enlarged openings to reduce peak inspiratory flow by an impressive 20%.
- Purification of exhaust air.
- The wide surface makes cleaning the regulator easier.
- Blow depth controller optimizes airflow with minimal effort.
- The patented Comfobite bite reduces jaw fatigue.
- Detachable and reusable bite clamp allows for quick and easy replacement without tools and plastic waste.
- The enlarged heat exchanger helps prevent freezing of the second stage mechanism.
- Air duct deflector.
- Directs the airflow evenly during the inhalation phase.
- Streamlined bi-material deflector reduces exhalation effort.
- Flexible and lightweight Aqua Flex hose with double protectors.