Apeks DS4 1st Stage (DIN)
Apeks DS4 1st Stage is able to maintain the same amount of air as the diver descends and the demand for air increases.
The very popular with Technical divers the Apeks DS4 1st Stage is able to maintain the same amount of air as the diver descends and the demand for air increases. The Apeks DS4 is able to do this by offering a unique over-tracking (over-balanced) diaphragm design, where the intermediate pressure supplied to the second stage increases more than traditional balanced models, as the diver descends to greater depths. The result is superior breathing performance regardless of depth.
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