First Stage. Balanced diaphragm operating system. DFC (patented) for minimizing the intermediate pressure drop during the inhalation phase, for improved breathing at all depths. 4 LP ports and 2 HP ports. High pressure poppet seat in corrosion-proof metal, replaceable. Shock-proof cap for protecting the 1st Stage. Second Stage. Simple, compact, reliable, with a unique and innovative look. Molded dual-material body (patent pending) to provide unique characteristics of lightweight and look. Practically neutral buoyancy under water, maximum comfort and minimum jaw fatigue. Integrated VAD system (patented) for superior performance and natural breathing in all conditions. Coverplate with mesh-grid design (patented). Exhaust tee with opening for inspection or replacing the exhaust valve. CE UNI-EN 250 Certification.