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 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 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.