The M1 Second-Stage is a balanced linear flow design for extremely easy breathing at all depths and dive conditions. The M1 is designed for cold water diving featuring thermal heat sink and improved super-dry exhaust valve. The M1 Second-Stage is built-to-last with a Zirconium plated brass demand valve body, titanium lever and sealing orifice. The diaphragm is made from high quality silicone rubber. This pneumatically balanced poppet second stage has Atomics patented seat saving dynamic orifice which unlike most second stage orifices is a floating valve design which reduces wear on the second stage poppet seat when the regulator is not pressurized adding Life to this important seal.

The M1 Second-Stage Regulator is equipped with Atomics patented automatic flow control (AFC). This unique diaphragm activated vain automatically controls the flow and venturi-effect of the second stage for optimum breathing resistance at all depths. The second stage does have a rapid adjustment knob for rare special situations. The M1 has a new high-flow second stage case design that significantly lowers breathing effort at any depth from shallow water to beyond the limits. A surge protected second stage cover for high current scenarios and a dual silicone comfort fit mouthpiece with tear resistant bite tabs. The M1 has a super wide exhaust deflector to disperse bubbles for enhanced visibility. The regulator comes equipped with a 3/8" threaded 32" (81.3cm) low pressure hose. The regulator weighs 13.8 oz. (391 g) with hose.