The M1 employs state-of-the-art metals specifically chosen for extreme diving situations. Monel parts are used internally in the first stage for high strength, corrosion-resistance and oxygen compatibility. 316-stainless steel, multi-layer zirconium coated brass and titanium is used throughout the second stage. The M1 valve body is zirconium/nickel over brass and the seat saving orifice is stainless steel. Engineered by Atomic for specialty diving the M1 has an expanded performance range to meet almost any diving condition imaginable, whether recreational or technical. Accomplished specialty divers will appreciate this regulator designed to fulfill virtually any need or diving scenario. The M1 is built on the same platform as the world acclaimed T2 and B2 regulators.

The M1 is a balanced flow-thru piston design using Atomics jet seat high-flow Monel piston. Exclusive high-pressure piston seal system is self-lubricating for low friction and low maintenance. The Atomic jet seat system has no sharp edges that can damage the seat over time, like most competitors' first stages. Instead, Atomic employs a conical seat and blunt-end piston. Atomics' valve seats are precision machined from an extremely strong aerospace specification seat material. This design combination is the most reliable seat system in the industry and enables the seat to go 2-years or 300 dives without service. Diving performance is superior at even low tank pressure. The chrome plated brass regulator is Nitrox ready for mixtures Up to 50% or oxygen mixes to 80% when special guidelines are followed out-of-the-box. The M1 is also freeze protected with a factory-sealed first-stage that also prevents contamination such as silt and sand entering the mechanism. The first-stage has 2 high-pressure (HP) 7/16" and 5 low-pressure (LP) 3/8" ports. The LP ports are on a swivel turret for ease of hose routing.

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.