Compact machined first stage based on the expedition-tested Apeks DS4 platform, engineered for reliable performance in demanding conditions.

• Innovative over-moulded endcap and environmental diaphragm help prevent ice build-up that can cause free-flow in extreme conditions and protect the first stage from impact damage.
• Large-surface-area heat-exchanger diaphragm clamp increases the gas temperature inside the first stage for improved cold-water performance.
• Over-balanced diaphragm design: as the diver descends, the medium-pressure gas in the hose increases at a faster rate than ambient pressure to enhance performance at depth.
• Ports: 2 HP ports and 4 MP ports.