The first inhalation underwater marks the beginning of a new adventure. The revolutionary combination of Venturi effect and inhalation effort adjustment is natural and intuitive. Aqualung’s Master Breathing System allows divers to control both with a single, simple rotation, delivering excellent performance on every dive. Designed so you can breathe easy. Designed and made in France.
First Stage
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AUTO CLOSURE DEVICE (ACD): Keeps the inlet shut to protect internal parts from debris and corrosive water when not connected to a cylinder valve. Helps maintain oxygen compatibility, preserves internal lubrication, and keeps the inlet filter clean and dry, extending service life.
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PERMANENT DRY CHAMBER: Where there’s no moisture, there’s no ice. Isolates internal components from the external environment, increasing freeze resistance in cold-water diving.
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DE-ICE: Deep ribs create a large heat-exchange surface, helping prevent ice formation on the mechanism. The overmolded cap delays ice buildup on the external diaphragm.
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OVER-BALANCED MECHANISM: Also known as Auto-Balanced. Overcompensates interstage pressure to reduce breathing effort, delivering effortless breathing regardless of depth or tank pressure.
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BALANCED DIAPHRAGM: Provides superior and consistent performance.
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BLUE HIGH PRESSURE SEAT: The core of the first stage. Opens and closes with every breath, forming a perfect seal with durable materials suitable for all conditions and gases. Automatically increases working pressure to counter higher gas density.
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DUST CAP PROTECTION: Attached to the regulator body to protect the inlet fitting and ACD from impacts and damage, sealing the first stage when off the tank.
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DIN AND YOKE SCREWS: Ergonomically shaped bi-material screws with Soft Grip surface for improved handling, even with cold hands.
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CHANNELED YOKE SCREW: Prevents water retention.
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HP / MP PORTS: Perfectly positioned for optimal hose routing.
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AVAILABILITY: DIN (4,350 psi / 300 bar max.) and YOKE (3,300 psi / 232 bar max.).
Second Stage
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COVER OPENING CHANNELS: Allow water to flow sideways over the diaphragm. Wide radial openings prevent freeflows in strong currents and reduce cracking effort by 20%.
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AIR CHANNEL DEFLECTOR: Streamlined bi-material component evenly directs airflow through the second stage and reduces exhalation effort.
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VENTURI ADJUSTMENT SWITCH: Enables precise airflow control. “MIN” position reduces valve assistance to avoid freeflow; “MAX” position maximizes assistance for lower inhalation effort. Easy to operate even with gloves.
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CRACKING EFFORT ADJUSTMENT: Allows fine tuning of breathing performance according to diving conditions.
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PNEUMATICALLY BALANCED: Ensures smooth, easy breathing at all depths.
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HEAT EXCHANGER: Prevents ice formation at the valve inlet.
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OVERMOLDED AIR PURGE: Large, easy-to-control purge area for effortless clearing.
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OVERMOLDED EXHAUST COVER: Soft-touch elastomer cover provides additional protection.
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BLACK COATING: Stainless-steel components feature a black Titadur® multi-layer coating for superior durability. Polymer parts are overmolded in black and anthracite tones for an exclusive finish.
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COMFOBITE MOUTHPIECE: Patented mouthpiece with a unique palate bridge that reduces jaw fatigue and keeps the second stage securely in place. Made from hypoallergenic silicone.
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INTERCHANGEABLE MOUTHPIECE: Detachable, reusable mouthpiece clamp allows quick, tool-free replacement, reducing plastic waste.
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REUSABLE MOUTHPIECE CLIP: Enables fast and easy mouthpiece changes.
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AQUA FLEX HOSE: Lightweight, flexible hose with dual protectors.
- Connection Type
- DIN
- 1st Stage Type
- Membrane
- 2nd Stage Compensated
- Balanced
- 1st Stage Protection
- ACD
- Color
- Black
Grey - Coldwater
- ✅
- Venturi
- ✅
- Breathing Effort
- Low
- Number of HP Ports
- 2
- Number of LP Ports
- 4
- 1st Stage Compensated
- Over Balanced
- Hose Type
- Flex
- Hose Color
- Black
- Environmental Sealed
- ✅
