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.

Aqualung Helix Pro (DIN)
3.8Comparison Score
$699
Buy on AmazonBuy on Scuba.com
Released2021
First stagediaphragm
BalancedYes
Environmentally sealedYes
Cold-water ratedYes
ConnectionDIN
Max pressure300 bar
HP / LP ports2 / 4
Adjustable 2nd stageNo
Weight734g
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
Diver community sentiment
Mostly positive

Divers on Scubaboard consistently describe the Helix Pro as an excellent value regulator, essentially a restyled Core/Titan LX platform, praising its light, comfortable second stage, smooth breathing, and adjustable venturi control for free-flow prevention. Posters note it can go years between services and that parts/service are widely available since it shares components with other Aqualung models used in rental fleets. For cold water, users note the Pro's sealing is aimed at very cold conditions, though at least one experienced diver said he never had issues diving winter temps without the sealed version. The only recurring nitpick is the lack of an MBS adjustment knob found on the pricier Legend LX.

Scubaboard: Helix Pro main discussion threadScubaboard: Core vs Titan vs Helix comparisonScubaboard: value/reliability discussion

Summarized from public forum discussion (Scubaboard, Reddit, and similar), not a survey we ran ourselves. See the linked threads for the original conversations.

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.