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 MK17/G260 Tatical Balanced Scuba Diving Regulator


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The SCUBAPRO MK17/G250 Tactical Regulator is the Ideal-System for Tech Divers and Cave Explorers, Perfect-for-Cold Waters and with Optimal Routing Options. The Mk17 First Stage Regulator is the perfect choice for the diver who wants the advantage of a Diaphragm First Stage for use in Temperate to Cold Waters. Diaphragm-Based First Stages are Environmentally-Sealed so that water cannot enter the inner mechanism. The Mk 17 also incorporates a Dry Ambient Pressure Chamber, providing better Performance in Cold Water than any other Diaphragm Regulator. Bearing in mind that Regulators Generate-Temperatures as low as minus 22°F (-5.5 °C) due to the incredibly fast moving air and the Pressure Drop involved, it is Imperative that Sensitive Moving Metal Parts Avoid-Contact with Extremely Cold Water or Debris. Therefore, Diaphragm First Stages have been the favored choice of Cold-Water Divers and those working in Contaminated or Muddy Water. SCUBAPRO Diaphragm First Stages feature Balanced Technology and are packed with patented features resulting in Ultra-Fast-Flow to the Second Stage on-demand and a Fantastic Overall-Performance. The MK17 First Stage`s Streamline Body is constructed of Machined Marine-Grade Chromed Brass. The MK17 has a Balanced Diaphragm to offer you peace of mind with its smooth breathing mechanisms and maximum performance that does not diminish as your tank`s air pressure changes. This First Stage comes standard with the Thermal Insulating System (TIS),

Air balanced diaphragm delivers constant and effortless airflow unaffected by depth, tank pressure, or breathing rate.
Environmentally sealed system prevents water and pollutants from fouling the inner mechanism.
More compact design features a smaller dry ambient pressure chamber and spring.
Dry ambient pressure chamber increases freezing resistance, ensuring consistent airflow in the coldest conditions.
Two high pressure and four high-flow ports maximize air delivery and hose routing options.
High-flow performance is available from all four LP ports which are configured for optimum hose routing.
Nylon fiberglass design features SCUBAPRO's largest second stage casing and diaphragm
Anodized aluminum front cover ring adds resistance without adding weight.
Metal components, including metal air barrel and metal valve inlet tube
High-flow exhaust valve reduces exhalation for better overall breathing comfort.
Air-balanced valve smoothes out the inhalation effort when diving at varying depths and supply pressures.
A diver-adjustable inhalation effort knob fine-tunes air delivery to suit changing depths, water conditions and personal tastes.
Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch prevents free flows in cold water or when used as an octopus.
Reversible hose attachment allows you to easily adjust hose routing for tech diving configurations.

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