Atomic Aquatics ST1 Stainless Steel Scuba Diving Regulator

Experience exceptional breathing performance, outstanding corrosion resistance and premium comfort with the Atomic Aquatics ST1 Stainless Steel Scuba Diving Regulator. Combining a precision-machined 316 stainless-steel first stage with lightweight titanium second-stage components, the ST1 delivers the durability serious divers demand without unnecessary weight.

Its balanced Jet Seat high-flow piston provides consistent airflow throughout the dive—even at depth or as cylinder pressure decreases. The factory-sealed first stage also protects critical internal components from cold water, silt, sand and other contaminants.

At the second stage, Atomic Aquatics’ pneumatically balanced design, Automatic Flow Control and Titanium Seat Saving Dynamic Orifice work together to provide smooth, natural breathing with minimal adjustment. A stainless-steel Comfort Swivel allows up to 30 degrees of movement, reducing hose pull when looking around underwater.

Available in DIN and yoke configurations, the Atomic Aquatics ST1 is a premium regulator for recreational divers, travelling divers and anyone seeking long-lasting performance in demanding marine environments.

Features and Benefits

Precision-Machined 316 Stainless-Steel First Stage

The first-stage body is machined from a special grade of solid 316 stainless steel. This high-strength material offers exceptional resistance to saltwater corrosion without requiring protective chrome or nickel plating.

Benefit: Outstanding durability, an attractive machine-turned finish and dependable performance over years of regular diving.

Titanium Second-Stage Components

The ST1 uses the same lightweight, corrosion-resistant titanium second-stage components found in Atomic Aquatics’ premium T3 regulator.

Benefit: Reduces weight at the mouth while delivering excellent strength, reliability and resistance to corrosion.

Balanced Jet Seat High-Flow Piston

Atomic Aquatics’ exclusive balanced piston design maintains stable intermediate pressure and strong airflow across a wide range of depths and cylinder pressures.

Benefit: Smooth and consistent breathing performance from the beginning of your dive through to lower tank pressures.

Factory-Sealed and Freeze-Protected First Stage

The environmentally sealed first stage helps isolate internal components from cold water, silt, sand and other outside contaminants.

Benefit: Improved reliability in challenging conditions with additional protection against contamination and freezing.

AFC Automatic Flow Control

The patented AFC system automatically adjusts airflow assistance as depth changes, reducing the need to continually alter a manual Venturi control.

Benefit: Natural, effortless breathing with fewer adjustments throughout the dive.

Rapid Adjustment Knob

A soft, overmoulded adjustment knob allows the second stage to be temporarily detuned when required.

Benefit: Helps reduce unwanted free-flow during surf entries, surface swimming or other demanding conditions.

Titanium Seat Saving Dynamic Orifice

Atomic Aquatics’ patented dynamic orifice automatically moves away from the seat when the regulator is not pressurised, helping prevent long-term impressions and wear during storage.

Benefit: Maintains crisp performance and factory-style tuning for longer.

Stainless-Steel Comfort Swivel

The second-stage hose incorporates a black PVD-coated stainless-steel swivel that provides approximately 30 degrees of movement.

Benefit: Minimises hose pulling, binding and jaw fatigue while allowing more comfortable head movement underwater.

Pneumatically Balanced Second Stage

The high-flow case, balanced poppet and lever system are engineered to provide easy inhalation at different depths and cylinder pressures.

Benefit: Consistent breathing performance throughout the dive with less perceived inhalation effort.

Elliptical Exhaust Valve

The specially shaped exhaust valve is designed to reduce exhalation resistance at depth.

Benefit: Easier exhalation and a more natural overall breathing cycle.

Full-Face Purge Cover

The dual-material second-stage cover allows virtually the entire front surface to operate as the purge button.

Benefit: Easy to locate and activate—even while wearing thick diving gloves.

Dual-Silicone Comfort Mouthpiece

A soft dual-silicone mouthpiece features durable, tear-resistant bite tabs.

Benefit: Provides a secure, comfortable fit while helping reduce jaw fatigue during longer dives.

Nitrox Ready to 40%

The ST1 is approved for non-dedicated enriched-air Nitrox use with mixtures containing up to 40% oxygen.

Benefit: Suitable for divers who alternate between standard compressed air and recreational Nitrox.

Atomic Aquatics ST1 Regulator Specifications

Why Choose the Atomic Aquatics ST1?

The Atomic Aquatics ST1 is ideal for divers who want the corrosion resistance and premium appearance of stainless steel combined with the lightweight comfort of titanium. Its effortless breathing performance, flexible hose routing, environmentally sealed first stage and extended service interval make it an outstanding regulator for frequent recreational diving, travel and demanding saltwater conditions.