Atomic ST1 First Stage Regulator

The Atomic Aquatics ST1 Swivel Sealed Regulator is a stainless steel first-stage. Stainless steel delivers virtually the same corrosion resistance as titanium at a lower price. Stainless steel does not require protective chrome or nickel-plating processes that can be harmful to the environment and is 100% recyclable. The first-stage is machined from solid 316-grade stainless steel.

The ST1 is a balanced flow-thru piston design using Atomics jet seat high flow stainless steel 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 ST1 is also freeze protected with a factory sealed first stage that also prevents contamination such as silt and sand from entering the valve mechanism. The regulator is Nitrox ready for mixtures Up to 40% 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.