First StageCompact machined first stage based on the expedition tested Apeks DS4 platform. Break through, innovative over-moulded first-stage endcap and environmental diaphragm helps prevent ice build-up that can cause first stage free flow in extreme circumstances. Also protects the first stage from impact damage. Large surface area heat exchanger diaphragm clamp helps increase the gas temperature inside the first stage, resulting in improved cold water performance. 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 faster rate than ambient. This results in superior performance at depth. With 2 High Pressure ports and 4 Medium Pressure ports.
Second StageCompact and lightweight second stage improves comfort and helps reduce jaw fatigue on long duration dives. High performance pneumatically balanced lever operated poppet valve. Large, over moulded self-flushing and controllable purge button. Ergonomic Venturi lever is easy to use and locate. Flexible nylon braided hose has better cold water performance than a traditional rubber hose. Standard metallic hose connection for interchangeability. Comfo-bite mouthpiece has a unique bridge that fits across the upper palate and does NOT require bite pressure to stay in place. Re-useable mouthpiece clip makes it simple to change mouthpieces in the field.
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Type of first stage |
Over-balanced diaphragm design, environmentally sealed |
Body Type |
One piece machined body |
Number of HP ports |
2 (7/16" UNF) |
Number of MP ports |
4 (3/8" UNF) |
Weight |
DIN – 905g (2 lb) Yoke – 1041g (2.3 lb) |
Environmental Dry Kit |
Standard |
First stage exterior |
Satin |
Coldwater Use |
Yes |
Type of second stage |
Pneumatically balanced |
Opening Effort Control Knob |
No |
Integrated Venturi Lever |
Yes |
Mouthpiece |
Comfo-bite™ |
Exhaust tee |
Standard, one set |
Heat Exchanger for freezing resistance |
Yes |
Hose type |
Braided Flexi-hose |
Overall work of breathing (WOB) scores |
Avg. 0.90 joules/liter |