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The second stage Vortex Assist Design (V.A.D.) system: the air bypass tube conveys air to the mouthpiece creating a swirling vortex with a low-pressure area in the center this keeps the diaphragm down during inhalation, giving very sensitive and easy breathing at all depths. The second stage cover features the new “mesh-grid” system for water inflow and outflow, which provides a further performance improvement. The compact and ergonomic exhaust tee ensures superior hydrodynamic performance and reduced exhalation resistance. Mares Prestige second stage incorporates the Fluid Dynamic Deflector, which is engineered to receive and properly direct the airflow from the bypass tube to the mouthpiece. Combined with the VAD system it delivers very natural and effortless breathing. All enclosed in a lightweight Techno-Polymer housing. Regulator has the super flex hose. Hose is extremely light weight and exceptionally soft, guaranteeing the maximum freedom of movement and reducing jaw fatigue. Super flex hose has 3/8″ Threads and is 31.5″ (80 cm) in length. The regulator weighs 33 oz. (936 g).