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The Aqualung Leg3nd Octopus regulator stands out for its pneumatically-balanced design that ensures smooth and easy breathing, its patented heat exchanger for excellent cold-water performance, and its high-visibility yellow design for easy identification during dives.
Yes, the Aqualung Leg3nd Octopus comes with a 39" (99cm) high-visibility yellow Aqua Flex hose that is lightweight and extremely pliable, eliminating any tugging on the mouthpiece.
Yes, the Aqualung Leg3nd Octopus is compatible with up to 40% O2 right out of the box, making it suitable for a range of diving conditions.
The Aqualung Leg3nd Octopus regulator weighs just 7.4 oz. (210 g), making it comfortable for divers to use.
The venturi switch on the Aqualung Leg3nd Octopus helps prevent free-flow at the surface and when the regulator is out of the diver's mouth, eliminating the need for divers to adjust the regulator during the dive.
Review Summary
2026-02-12T08:45:54
I have always been partial to US Divers / Aqualung. Got the Leg3nd system as a replacement for my USD Micra a couple of years ago and am very happy with it. Added this Octo about a year ago because I solo-dive most of the time and wanted to have a backup other than my AirSource for the occasions where I buddy-up with a random diver on a trip.
Dennis M.
2021-08-16T19:35:50
Excellent, good materials. This octo is better than most regulators, it is very convenient to adjust the air flow so that there is no free-flowing as you enter the wate.r
Bernal B.

2021-04-24T17:02:36
Great regulator. Dependable, Light. Aqua Lung has and produces nothing but 5 star products
GARY P.
2020-09-21T08:26:00
Vary happy with my purchase
BILLY S.
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Browse our FAQ
Yes, Dive/Pre-Dive Venturi (Free Flow) Switch
Yes, Up to 40% Oxygen
Pneumatically Balanced
Case: Techno-Polymer
3/8"
39" (99cm)
7.4 oz (210g)
191649990538
Great complement to an already great Leg3nd setup.
By Dennis M.
I have always been partial to US Divers / Aqualung. Got the Leg3nd system as a replacement for my USD Micra a couple of years ago and am very happy with it. Added this Octo about a year ago because I solo-dive most of the time and wanted to have a backup other than my AirSource for the occasions where I buddy-up with a random diver on a trip.
Excellent Second Stage
By Bernal B.
Excellent, good materials. This octo is better than most regulators, it is very convenient to adjust the air flow so that there is no free-flowing as you enter the wate.r

LEG3ND is for the passionate, the explorers, the ones for whom diving is more than a sport. Aqua Lung, the original pioneer of the scuba regulator, brings you the most capable, coveted and advanced line of regulators ever created: This is the new LEG3ND, a masterpiece of engineering, built for all conditions, all depths and all dives.
After all, the ocean is the ultimate proving ground - a place where respect is given and earned equally, where true Legends belong.




Aqualung is synonymous with the modern scuba regulator. Over 70 years of innovation have gone into making scuba regulators that are safer and easier to use than others on the market. An Aqualung scuba regulator offers you comfort, ease of breathing, control and peak performance. Aqualung and the scuba regulator share a rich history, and now is your chance to play a part. Choose the right scuba regulator to ensure your next dive is comfortable and safe. Aqualung has developed diving regulators built for new and experienced divers, as well as for a range of diving conditions.
To compliment the Leg3nd regulator family, Aqualung created the Leg3nd Supreme Octopus. This high-visibility, yellow version of the Leg3nd second stage is ideal to complete your system. Pneumatically-balanced second stage results in smooth, easy breathing. A venturi switch helps prevent free-flow at the surface and when the regulator is out of the diver's mouth. The opening effort is pre-set in a fixed position so the diver doesn't have to worry about adjusting the regulator during the dive. The silicone mouthpiece with ergonomic bite wings and comfort. A heat exchanger (patented) which surrounds the valve mechanism, dissipates the cold caused by gas expansion while drawing in the warmth of the ambient water. Excellent cold-water performance due to highly efficient heat exchanger surrounding the valve.
The ergonomic exhaust tee channels the exhaust bubbles out of your field of vision. The design also contributes to a reduction in exhalation effort. Attached to a 39" (99cm) yellow high visibility braided Aqua Flex hose. These hoses are lightweight and extremely pliable which eliminates any tugging on the mouthpiece. Regulator has high-visibility yellow purge cover and accent pieces. Compatible with up to 40% O2 right out of the box.
https://us.aqualung.com/pages/warrantypolicy
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