Aqualung

Aqualung Calypso (Yoke)

Aqualung's entry-level piston set, simple and low-maintenance, with a genuinely adjustable Venturi second stage.

Aqualung Calypso (Yoke)
2.8Comparison Score
$389
Buy on AmazonBuy on Scuba.com
Released2017
First stagepiston
BalancedNo
Environmentally sealedNo
Cold-water ratedYes
Connectionyoke
Max pressure232 bar
HP / LP ports1 / 4
Adjustable 2nd stageYes
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
  • Adjustable Venturi switch with min/max settings gives real diver control over airflow, unusual at this budget tier
  • Simple unbalanced piston design that's historically easy and cheap to service
  • Nitrox-ready to 40% out of the box
Cons
  • Unbalanced piston first stage and unbalanced second stage mean breathing effort drifts more as tank pressure drops and at depth
  • No environmental sealing or dry chamber, not suited to cold or silty/contaminated water
  • No octopus confirmed as part of this base set, factor that into total cost
Diver community sentiment
Mixed opinions

Across several Scubaboard threads, divers consistently describe the Calypso as a simple, reliable, inexpensive entry-level regulator that breathes easily and dry in shallow, warm-water recreational conditions, matching Scuba Diving magazine's ScubaLab "Testers Choice" rating. Recurring complaints center on its unbalanced piston first stage: breathing becomes noticeably harder below roughly 60-80 feet and as tank pressure drops. Several posters flagged a marked quality decline in newer production runs (plastic orifices, non-standard hose fittings) compared to older all-metal versions. A UK government recall also documents a real manufacturing defect in some Calypso first-stage bodies risking uncontrolled free-flow, affecting specific serial/part numbers.

Scubaboard: Calypso as an entry-level regScubaboard: quality-decline discussionUK.gov: official Calypso recall notice

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

The Calypso is Aqualung’s budget entry point, a straightforward unbalanced piston paired with an adjustable-airflow second stage. It’s positioned well below the Helix and Helix Pro in the lineup, trading sealed, balanced performance for a lower price and simpler maintenance.