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 MK21/G260 Regulator - Yoke


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Feature1Air-balanced flow-through piston provides constant and effortless airflow unaffected by depth, tank pressure, or breathing rate.
Feature2Unique thermal exchange design with external fins optimizes freezing resistance.
Feature3Two high pressure ports, one on each side of the body, allows the first stage to be positioned either up or down.
Feature4Standard "smart" hose routing cap offers four low pressure ports.
Feature5Optional hose routing cap increases routing configurations with four angled low pressure ports.
Feature6Redesigned yoke allows for easier mounting on a cylinder, and redesigned cap.
Feature7Nylon fiberglass design features SCUBAPRO's largest second stage casing and diaphragm.
Feature8Anodized aluminum front cover ring adds resistance without adding weight.
Feature9High-flow exhaust valve reduces exhalation for better overall breathing comfort.
Feature10Air-balanced valve smoothes out the inhalation effort when diving at varying depths and supply pressures.
Feature11A diver-adjustable inhalation effort knob fine-tunes air delivery to suit changing depths, water conditions and personal tastes.
Feature12Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch

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