Apeks' DS4 first stage is sealed against water, and adapts to your depth using a membrane that transfers the pressure to the membrane that controls the air pressure. 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 DS4 first stage has 4 medium pressure outlets in size 3/8 UNF and 1 high pressure outlet in size 7/16 UNF
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