The Helix Pro mid-range regulator embodies the DNA of Aqualung's technical excellence. Representing our core range, it offers superior breathing performance with its balanced first and second stages. Featuring patented ACD technology, the first stage remains fully protected even when not under pressure, ensuring durability. The Helix Pro is the epitome of value, designed for the coming years and serviced every 2 years for optimal performance. Designed and made in France.

First Stage

AUTO CLOSURE DEVICE. The ACD keeps the inlet shut to protect internal parts from debris and corrosive water when not connected to a cylinder valve. It helps to maintain oxygen compatibility, preserve internal lubrication, and keep the inlet filter clean and dry. This extends the life of the first stage between services.

PERMANENT DRY CHAMBER
Where there's no moisture, there's no ice. The Permanent Dry Chamber keeps internal parts clean and dry by isolating them from the outside environment. This enhances overall freeze resistance of the regulator when diving in cold water.

OVER-BALANCED MECHANISM
Also known as Auto-Balanced, the Over-Balanced Mechanism overcompensates the interstage pressure to reduce your breathing effort. Regardless of depth or tank pressure, it provides effortless breathing from the beginning to the end of your dive. This results in superior performance at depth.

BALANCED DIAPHRAGM
Provides superior and consistent performance.

BLUE HIGH PRESSURE SEAT
It is the core of the first stage. The Blue High Pressure Seat opens and closes with every breath, forming a perfect seal with durable materials that work in all conditions and with all gasses. The working pressure of the first stage is automatically elevated to counteract the increased breathing air density.

DUST CAP PROTECTION
Attached to the regulator body, the Dust Cap protects the inlet fitting and the Auto Closure Device from impacts and damage. It also seals the first stage when it's off the tank.

HP/MP PORTS.

HP and MP ports and "T" Shape o 2 HP ports (7/16”) and 4 MP ports (3/8”) perfectly oriented in a “T” shape for streamlined hose positioning.

Second Stage

COVER OPENING CHANNELS
The Front Cover Opening Channels allow water to flow sideways over the diaphragm. The wide radial openings prevent freeflows when diving in strong currents and reduces cracking effort by 20%.

VENTURI ADJUSTMENT SWITCH

The Venturi Adjustment Switch allows divers to precisely control and adjust the air flow. In the “MIN” position, the valve's assistance is minimized, resulting in a higher inhalation effort, ideal to avoid freeflow. In the “MAX” position, the valve's assistance is maximized, resulting in a lower inhalation effort. The overmolded elastomer and ergonomically designed lever allow control of the air flow even while wearing gloves.

PNEUMATICALLY BALANCED
For smooth and easy breathing at all depths.

HEAT EXCHANGER
Prevent ice forming on the valve inlet.

COMFOBITE
A patented and comfortable mouthpiece featuring a unique palate bridge reduces jaw fatigue and securely holds the second stage in place. Made from hypoallergenic silicone, the orthodontic mouthpiece is both soft and sturdy.

INTERCHANGEABLE MOUTH PIECE
The detachable and reusable mouthpiece clamp allows for quick and simple tool-free change, avoiding plastic waste.

REUSABLE MOUTHPIECE CLIP
Perform quick and easy mouthpiece changes using the removable, reusable clip.

BRAIDED HOSE
Provides flexibility, comfort and excellent transportability.

First stage

Type: Diaphragm
Technology: Balanced
Max Working Pressure: 300 bar on DIN
Auto-Closure Device (ACD): YES
Environmental Chamber: YES
Number of HP ports: 2
Number of MP ports: 4
1st Stage Weight in DIN: 740g
Nitrox Compatible: YES, when new, out of the box

Second stage

Type: Balanced
Technology: Downstream Valve
Venturi Vane: YES
Adjustment Knob: NO
Comfobite mouthpiece: YES
Heat Exchangers: YES
Lip shield: YES
Weight: 205g
Nitrox compatible: YES, when new, out of the box