You cannot breathe directly out of a scuba tank because of the high pressure. A regulator reduces pressure to safe a level that can be inhaled by the diver. A diving regulator has two parts: the First Stage reduces the tank pressure and connects it to the Second Stage which contains the mouthpiece for breathing

Scubapro MK25 EVO/S600 Deep Blue Titanium Core Regulator


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    A WINNING COMBINATION Ease of breathing is the essence of this reg system -- and it looks good too. The high performance MK25/S600 Deep Blue Titanium Core has long been known for its low work of breathing and tremendous reserve capacity. Year after year, in successive independent tests, it has consistently ranked as one of the top-performing regs on the market. Add the durable jewel-colored DEEP BLUE PVD (Physical Vapor Deposition) finish on both first and second stages, providing superior scratch- and corrosion-resistance, and you've got a reg system that breathes like a dream and looks dynamit For 2016 this solid reg system benefits from another substantial upgrade with the addition of the MK25 EVO, featuring SCUBAPRO's patented Extended Thermal Insulating System (XTIS). This exclusive engineering advancement lets you enjoy an ultra-fast breathing response, instant delivery of air on demand, great sensitivity and extra-high airflow - regardless of how cold the water is. The XTIS makes this possible by fully isolating the mechanical elements of the first stage from the cold, increasing its freezing resistance 30 percent over the current MK25 without compromising breathing performance. This makes the MK25 EVO the ultimate do-it-all first stage for all water temperatures. Like the MK25 EVO first stage, the air balanced S600 DEEP BLUE TITANIUM CORE is a special second stage. It features an interior titanium barrel for lightweight performance and additional corrosion resistance. The S600 DEEP BLUE TITANIUM CORE delivers effortless inhalation and exhalation. It's easy to use too, with efficient user controls that include a powerful purge, an inhalation effort control knob and Venturi Initiated Vacuum Assist (VIVA) dive/pre-dive switch. Synonymous with SCUBAPRO quality and unbeatable engineering, the MK25 EVO/S600 DEEP BUE TITANIUM CORE is the preferred combo of many dive professionals. In all water temperatures, in the most demanding dive conditions, this reg performs flawlessly, and it looks great doing it.

    Air balanced flow-through piston in a chrome-plated brass body
    Patented XTIS (Extended Thermal Insulating System) fully isolates the mechanical elements from the cold,
    New spring insulating coating, body insulating bushing, anti-freeze cap, bigger body and cap thread
    Anti-freeze protection radically increases breathing reliability when diving in the most extreme water temperatures.
    Two opposing high pressure ports allow the first stage to be positioned either up or down.
    Five high-flow low pressure ports on a swivel turret maximize hose routing options.
    Metal valve housing (barrel) is able to withstand years of aggressive diving.
    User controls include a diver-adjustable inhalation effort knob and Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch.
    Super-flow hose features an oversized bore (larger inside hose diameter) that allows more air to flow on each inhalation.
    Ultra-comfortable orthodontic mouthpiece is easy to grip yet doesn't inhibit airflow.

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