Aqualung

Aqualung Helix (Yoke)

The same balanced diaphragm first stage as the Helix Pro, without the sealed dry chamber.

Aqualung Helix (Yoke)
$499
Buy on Amazon
Released—
First stagediaphragm
BalancedYes
Environmentally sealedNo
Cold-water rated—
Connectionyoke
Max pressure232 bar
HP / LP ports2 / 4
Adjustable 2nd stageNo
Weight875g
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
  • Shares the same balanced diaphragm first stage and pneumatically balanced second stage as the pricier Helix Pro
  • Matching 2 HP / 4 LP port layout, so hose-routing flexibility isn't cut at the lower price
  • Nitrox-ready to 40% out of the box
Cons
  • No Auto Closure Device or dry chamber, unlike Helix Pro, so it isn't built for cold or silty/contaminated water despite sharing the same balancing technology
  • No dedicated breathing-resistance knob, only a venturi pre-dive/dive switch
  • No longer listed as a standalone model on Aqualung's current US site, worth confirming parts and service support before buying

The base Helix uses the same balanced diaphragm first stage as its Helix Pro sibling but skips the ACD and permanent dry chamber, making it a genuine step down in environmental protection rather than in core balancing technology. It’s a sensible pick for warmer, cleaner water where sealing isn’t a priority.