The DST first stage from Apeks is sealed against water and adapts to your depth using a membrane that transfers the pressure to the membrane that controls the air pressure. Apeks DST can also rotate to make hoses lie more comfortably during the dive. This first stage uses an overbalanced diaphragm design that provides greater flow at deeper depths than traditional balanced models. The result is good and easy breathing, no matter how deep you dive.
The DST first stage has 4 medium pressure outputs in the size 3/8 UNF and 2 high pressure outputs in the size 7/16 UNF
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