Atomic Aquatics ST1 Stainless Steel Regulator

Atomic Aquatics ST1 Stainless Steel Scuba Diving Regulator

The ST1 combines a stainless steel first stage with Atomic’s balanced regulator design. Its Comfort Swivel and second-stage adjustment features help you arrange a comfortable setup, making it a distinctive choice for divers who value premium materials and familiar Atomic controls.

A different material choice

The ST1 is the option to consider when you want a stainless steel first stage with Atomic’s titanium second-stage components. It combines a substantial first-stage material with a light breathing mechanism and a swivel hose connection, so the specification translates into benefits you can feel when carrying and using the regulator.

Features and benefits

Balanced gas delivery. The balanced Jet Seat piston design helps manage the supply to the second stage as diving conditions change.
Balanced second stage. The balanced valve helps maintain a consistent inhalation response.
Environmental protection. The sealed first-stage chamber helps keep water and contaminants away from its working mechanism.
Mouthpiece comfort. The supplied dual-silicone comfort-fit mouthpiece supports a comfortable hold at the second stage.
Connection options. 2 HP ports and 5 on swivel cap LP ports support the stated gauge and hose configuration.
Stainless first-stage construction. The 316 stainless steel first stage provides corrosion resistance in a metal finish that distinguishes the ST1 from Atomic’s brass-bodied options.
Titanium second-stage components. Titanium valve components combine corrosion resistance with low weight at the second stage.
Seat-saving design. The dynamic orifice moves away from the seat when unpressurised, reducing sustained seat loading during storage.
Flexible routing. Five low-pressure ports on the rotating cap help arrange hoses around the BCD, drysuit and alternate-air setup.

Setup and compatibility

Connection: DIN, Yoke. Choose the fitting that matches your cylinder valve and its pressure rating.

Technical Specs

Atomic Aquatics ST1 Stainless Steel Scuba Diving Regulator technical specifications
Brand	Atomic Aquatics
Main model / configuration	Atomic Aquatics ST1
Product type	Regulator
Regulator type	Primary Regulator
Regulator connection	Din, Yoke
First-stage design	Balanced Jet Seat high-flow piston
Second-stage design	Pneumatically balanced
High-pressure ports	2
Low / medium-pressure ports	5 on swivel cap
Environmental sealing	Yes, factory sealed
Cold-water suitability	Freeze-protected first stage
Breathing adjustment	Rapid adjustment knob
Mouthpiece	Dual-silicone comfort-fit mouthpiece
Nitrox / oxygen compatibility	Up to 40% oxygen
First-stage materials	316 stainless steel
Second-stage materials	Titanium components
Hose	Stainless steel Comfort Swivel
Inhalation-effort control	AFC Automatic Flow Control
Hose connection	Black PVD-coated stainless-steel Comfort Swivel

Additional specifications

Environmental protection	Factory sealed and freeze protected
Second-stage components	Titanium
Swivel movement	Approximately 30°
Available connections	DIN or yoke
DIN maximum pressure	300 bar / 4350 psi
Yoke maximum pressure	241 bar / 3500 psi
Yoke version weight	Approximately 1.04 kg / 2.3lb

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.
The ST1 uses the same lightweight, corrosion-resistant titanium second-stage components found in Atomic Aquatics’ premium T3 regulator.
Atomic Aquatics’ exclusive balanced piston design maintains stable intermediate pressure and strong airflow across a wide range of depths and cylinder pressures.
The second-stage hose incorporates a black PVD-coated stainless-steel swivel that provides approximately 30 degrees of movement.
The ST1 is approved for non-dedicated enriched-air Nitrox use with mixtures containing up to 40% oxygen.
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.

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.

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.

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.

Based on Atomic Aquatics product information.

Regulator Connection	Din, Yoke

We dispatch orders five days a week, usually within 1–3 days. Standard mainland Australian shipping is $20. Click & Collect from our Hallam store is free once your order is ready.

Large or bulky gear: additional freight charges apply on top of standard shipping: large dive bags $30; long freediving fins $15; long spearguns $20. Scuba tank freight is shown at checkout.
Rural, remote & offshore: rural means anywhere outside metropolitan areas. Carrier availability and additional charges may apply, including for island and territory destinations. Our team will contact you if an extra freight quote is needed.

The available delivery rate for your order is shown at checkout.

Read our full shipping and delivery information →

We offer a 30-day exchange on most unused products within Australia when they are in saleable condition with their original packaging and accessories. Please contact us with your order number before returning an item. Change-of-mind refunds are not offered; this does not limit your rights for faulty products under Australian Consumer Law.

Read our full returns and exchanges policy →

FREE CLICK & COLLECT
Usually ready same day*

Select local pickup at checkout. We will email you when your order is ready. Please wait for your ready-to-collect confirmation before visiting, then bring your confirmation email and photo ID.

Collect from our Hallam store
Factory 4 / 56–60 Hallam South Rd
Hallam VIC 3803

*For items in stock at our Hallam store during opening hours, subject to order processing. Available-to-order and special-order items take longer. Collection is unavailable while the store is closed.

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Can I collect my order from the store?

Yes. Choose free local pickup at checkout and wait for your ready-to-collect email before visiting our Hallam store. Bring your confirmation and photo ID. See Click & Collect details.

How do I choose the right size?

Use the product's size chart where available and compare your measurements with the guide for that brand. Sizing varies between brands and products. If you are unsure, contact our team before ordering and we can help you choose.

How do I check availability?

Select your required options, such as colour and size, to see availability for that variation. If an item is marked “Available to order”, check the estimated dispatch information. Please contact us before ordering if you need gear by a particular date.

When will my order be dispatched?

Orders are usually dispatched within 1–3 days, subject to stock availability. Available-to-order and special-order products may take longer. Delivery time is separate from dispatch time and depends on your location and the carrier. Read our shipping information.

Can I exchange an item if it does not fit?

We offer a 30-day exchange policy on most unused products within Australia, subject to eligibility. Contact us with your order number before returning an item. Read the exchange conditions and next steps.

Can you help me choose the right gear?

Yes. Call 03 9702 3694 during store hours or email [email protected]. Tell us which product you are considering and how you plan to use it.

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Atomic Aquatics ST1 Stainless Steel Scuba Diving Regulator

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