The Apeks DS4 first stage has a unique over-balanced, diaphragm design- as the diver descends, the over-balancing feature allows the medium pressure gas in the hose to increase at a rate faster than ambient. This results in superior performance at depth.
- An environmental dry system keeps water out of the main spring chamber thus preventing ice buildup and keeping silt and contamination out.
- Dry sealed system for cold water
- No rotating turret
- 4 medium pressure ports 3/8 UNF
- 1 high pressure port 7/16 UNF
- Comes with Din and INT