Aquilion

One of the first single hose demand valves

The first stage has a vairable pressure control. This feature was in demand to regulate the pressure in factory compressed air supplies, so it is common to find an Aquilion today without its first stage.

 

Was it easier to breathe than the Mistral?  That depends. During a dive in a horizontal face down position, yes. Ascending and deco stops no. Swimming on your side or carrying out work facing towards the surface, the Mistral wins by a mile.

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