The LEG3ND ELITE gives divers unprecedented capabilities by providing perfect precision and enhanced ergonomics at your fingertips. Advanced divers appreciate the independent micro adjustments to fine-tune their own individual breathing preferences.​ In the Box: Aqua Lung LEG3ND Yoke first stage, second stage, and user's guide. First Stage When the first stage is not connected to a cylinder valve, the Auto Closure Device (ACD) keeps the inlet shut to protect the first stage internal parts from contamination and corrosive water. This accomplishes preservation of the internal lubrication, keeping the inlet filter clean and dry, and is safer for elevated percentages of oxygen. Exceptional cold-water performance is achieved by modernizing Aqua Lung's anti-freeze properties. Auto-Balanced: Progressive increase of the working pressure to maintain optimum breathing efforts. Depending on the diver's depth, the working pressure of the first stage is automatically elevated to counteract the increased breathing air density. Ergonomically shaped Yoke screws made of a bi-material “Soft Grip” surface provide a better hold when installing or removing the first stage – especially with cold hands. A specialized ACD Dust cap comes attached to the regulator body to protect the inlet fitting and the ACD system from impacts or damage. Perfectly positioned HP and MP ports provide optimal hose routing. Second Stage The new front cover opening channels allow water to flow sideways over the diaphragm. The new design contains radial openings to prevent freeflows when diving in stronger currents and the openings have been widened to reduce peak inspiratory flow by an impressive 20%. The new overmolded exhaust cover is made of elastomer with a “soft touch” effect.