Aqualung Helix Pro OctopusThe Helix octopus provides the same great performance as the Helix Pro primary second stage. Features The Helix octopus is pneumatically balanced resulting in smooth and easy breathing 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 The easy to grip venturi lever prevents unwanted freeflow at the surface while giving a performance boost at