Aqualung

Aqualung Helix Pro (DIN)

Aqualung's mid-tier sealed regulator, a balanced diaphragm first stage with a patented Auto Closure Device for cold-water protection.

Environmentally sealed, cold-water rated

Sealed first stage keeps water and ice crystals out of the internal mechanism, the standard for diving below 50°F/10°C.

No image yet
$699
Released—
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure300 bar
HP / LP ports2 / 4
Adjustable 2nd stageNo
Weight—
Nitrox-ready (EAN40)Yes
Octo includedNo

"HP / LP ports" is the number of high-pressure and low-pressure ports on the first stage, which caps how many accessories (transmitter, SPG, inflator, second second-stage) you can run at once.

Pros
  • Balanced diaphragm first stage paired with a pneumatically balanced second stage keeps breathing effort consistent through the dive
  • Patented Auto Closure Device plus a permanent dry chamber give real, hardware-backed cold-water and contaminant protection
  • Dual HP and quad LP "T" port layout leaves room for a computer, SPG, BCD inflator, and drysuit hose all at once
Cons
  • Second stage has only a venturi pre-dive/dive switch, no dedicated fine breathing-resistance knob
  • No octopus included at a $699 price point
  • Sold as separate DIN and yoke versions, so double-check the listing matches the DIN connector described here

The Helix Pro sits in the middle of Aqualung’s current lineup, using the same ACD-and-dry-chamber sealing approach as the flagship LEG3ND Elite but on a simpler, cheaper second stage without a dedicated adjustment knob. It’s nitrox-ready to 40% out of the box and aimed at divers who want genuine cold-water sealing without paying flagship prices.