A diving regulator supplies you with air or a special mix of breathing gases from a cylinder you carry on your back. Diving equipment manufacturers make a range of regulators for different environments and diver preferences.
There are typically four components to a regulator system: first stage, second stage, alternate, and gauges. The first stage attaches to the tank, converting high-pressure air to intermediate pressure. The second stage converts the intermediate-pressure air to breathable pressure. The alternate is a backup regulator, and the gauges measure air pressure and depth.
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