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

Stainless steel first stage. The unplated 316 stainless steel body provides corrosion resistance without relying on a protective chrome finish.
Balanced Jet Seat piston. The balanced piston regulates the second-stage supply as cylinder pressure changes, supporting a consistent breathing response.
Factory environmental seal. The sealed first stage helps keep silt and sand away from the mechanism and provides freeze protection for its intended diving conditions.
Balanced second stage. Pneumatic balancing reduces the force needed to open the demand valve, helping the second stage respond smoothly as you inhale.
Automatic Flow Control. AFC changes the Venturi assistance as depth changes, reducing the need for manual flow adjustment. The Rapid Adjustment Knob provides additional control for handling and specific diving situations.
Rotating hose turret. The low-pressure turret turns to follow hose direction, making it easier to arrange hoses without tight bends around the first stage.
Titanium valve components. Titanium combines low weight with resistance to seawater corrosion in the second-stage mechanism, making it useful for regular saltwater diving.
Comfort Swivel. The second-stage hose connection moves with your head, helping reduce hose pull and strain at the mouthpiece.
Seat-saving design. When the regulator is depressurised, the dynamic orifice lifts away from the low-pressure seat. This reduces prolonged loading on the seat during storage.

Setup and compatibility

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

Care, rinsing and storage

After each dive, connect the assembled regulator to a scuba cylinder and open the valve to pressurise the system. Keep it pressurised while fully submerging the first stage, second stages and connected hoses in fresh water. This allows thorough cleaning of the exposed components and hoses while helping prevent water entering the internal air passages, where it can cause corrosion and damage. Keep the cylinder secure throughout cleaning.

For routine cleaning, Dive Gear Australia recommends Cressi Neoclean Wetsuit Wash Neoprene Cleaner 500 mL or Revivex Wetsuit Shampoo 10 oz to help remove salt, chlorine and everyday residue. Dilute according to the cleaner’s label, then rinse thoroughly with fresh water.

Keep the regulator pressurised throughout washing and rinsing. Lift it out of the water and dry the first stage and cylinder connection before closing the cylinder valve, releasing the pressure and disconnecting. Fit the clean, dry dust cap, then allow the regulator to dry in the shade. Store it with the hoses loosely curved, without sharp bends or tension.

Before each dive, inspect the mouthpiece, hoses and connections for wear or damage. Have your regulator serviced by an authorised Atomic Aquatics technician at the interval specified in its manual, or sooner if it leaks, is damaged or its breathing performance changes. Leave internal adjustments and repairs to a qualified technician.

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	Black PVD-coated stainless-steel Comfort Swivel
Inhalation-effort control	Rapid Adjustment Knob

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

Based on Atomic Aquatics product information.

Regulator Connection	Din, Yoke

In-stock orders placed before 12 noon Melbourne time on weekdays are usually dispatched the same day once payment is confirmed. This excludes public holidays, pre-orders, backorders, special orders and custom orders. Dispatch times can vary. Delivery time depends on the carrier and your location.

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.

Need your gear urgently? You are welcome to arrange your own same-day courier or Uber pickup from Hallam. Call 03 9702 3694 before booking so we can confirm payment, that your order is packed and ready, and a collection time. Tell us who will collect and give your driver the order number. You arrange and pay the courier directly; delivery timing depends on the provider.

Read our full shipping and delivery information →

Contact us within 30 days of delivery to request a refund, exchange or optional store credit on eligible unused goods within Australia. Refunds go to the original payment method. Keep goods clean and undamaged with tags, original packaging and all accessories. No restocking fee applies to eligible returns meeting these conditions.

For change-of-mind returns and size exchanges, you pay return postage and replacement shipping. Original delivery charges are not refunded. Water-tested goods, clearly marked clearance items and genuinely custom-made or personalised items are excluded from change-of-mind returns. Ordinary discounted goods remain eligible.

For product problems, please call 03 9702 3694 before returning an item so we can help and explain the next steps.

Still unsure which size to choose?

Call our experienced dive instructors on 03 9702 3694 before ordering. Have your measurements and preferred product ready so we can help you choose the most suitable size. Fit varies between brands and models.

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.

Need your gear urgently? You can arrange your own same-day courier or Uber pickup. Call 03 9702 3694 before booking so we can confirm payment, that your order is packed and ready, and a collection time. Tell us who will collect and give your driver the order number. You arrange and pay the courier directly; delivery timing depends on the provider.

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.

View collection details and opening hours →

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. Still unsure? Call our experienced dive instructors on 03 9702 3694 during business hours before ordering. Have your measurements and preferred product ready. For fins and boots, tell us which socks or dive boots you will wear.

How do I check availability?

Select your required options, such as colour and size, to see availability for that variation. “Available to order” means the item may need to be sourced before dispatch. Call 03 9702 3694 to check the current lead time before ordering, especially if you need your gear for a trip or a particular date.

When will my order be dispatched?

Can I exchange an item if it does not fit?

Contact us within 30 days of delivery to request a refund to the original payment method, exchange or optional store credit on eligible unused goods. You pay change-of-mind return postage and replacement shipping; original delivery charges are not refunded. No restocking fee applies to eligible returns. Clearance and genuinely custom-made items are excluded from change-of-mind returns. Read the return 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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