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Atomic ST1 Swivel Sealed Regulator, Adjustable Second Stage



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  • Nitrox ready for mixtures up to 40%
  • Performs well even at low tank pressure
  • Optimum breathing resistance at all depths
  • The most reliable seat system in the industry
  • Durable with low maintenance requirements

A rugged, virtually bulletproof piece of gear, the Atomic Aquatics ST1 Swivel Sealed Regulator is built strong to last a lifetime. Stainless steel delivers virtually the same corrosion resistance as titanium at a lower price. No chrome or nickel plating that can chip off and isn't particularly environmentally-friendly. The entire first stage is machined from solid 316-grade stainless steel -- much stronger than a multi-piece design.

The ST1 regulator's design uses Atomic's jet-seat high-flow stainless steel piston mechanism. This exclusive system is self-lubricating for low friction and almost no maintenance. No sharp edges that can damage the seat over time -- instead, Atomic employs a conical seat and blunt end piston. Precision-machined valve seats use an extremely strong aerospace-spec material tested for military applications. Among the most reliable seat systems in the industry -- this seat can 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.

Customers are saying

...they are not only convenient (plenty of ports for your regulator, inflator & octopus) but very comfortable with the built in swivel at the 2nd stage.

This regulator with the pivot head ball is awesome! Breathing is smooth; no tight, restricted flow at depth. the ball articulation allows for a more comfortable fit; less pressure from the air hose pulling on the mouthpiece. Materials are top notch.

The ST1 second stage is a balanced linear flow design for extremely easy breathing at all depths and dive conditions. The ST1 Series second stage is built-to-last with a titanium demand valve body, 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 ST12 series 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 soft over molded rapid adjustment knob for rare special situations. If you have ever experience the pulling effect" of the regulator second-stage when you turn your head underwater, those days are gone with Atomics comfort swivel. Perhaps one of the most admired features of Atomic second stages is the patented comfort swivel which allows 30° rotational movement without binding or kinking. The regulator comes equipped with a 3/8" threaded 32" (81.3 cm) low-pressure hose. The regulator weighs 2.3 lbs. (1059 g) and comes with an owner's manual.

More Info

  • Product Sku: 138311
  • Max Nitrox Mix: 40% O2
  • Length Hose (inches): 32
  • Adjustable Second Stage: Yes
  • Balanced: Balanced
  • Number of HP Ports: 2
  • Number of LP Ports: 5
  • Material: Stainless Steel
  • Accessory: No