The Atomic M1 Regulator with DIN Sealed is a top-tier scuba diving regulator designed for extreme performance under a variety of diving conditions. The first stage features a balanced piston design with a factory-sealed chamber, protecting the internal components from the harsh external environment, which makes it suitable for cold water and contaminated conditions. The M1 second stage is known for its smooth, easy breathing and includes features like Automatic Flow Control (AFC) and a rapid adjustment knob for rare special situations. It is a popular choice among technical, deep, and cave divers.