Atomic ST1 Regulator
Atomic ST1 Regulator
Atomic ST1 Regulator
Atomic ST1 Regulator
Atomic ST1 Regulator

Atomic ST1 Regulator

Sale price£1,184.00

Atomic ST1 Regulator has twice the strength of brass with the durability of Titanium. It delivers virtually the same corrosion resistance as Titanium at a lower price.

DIN or A-Clamp?

DIN or A-Clamp?


Dispatched 5 to 10 days

Contact Form & Details

How can we help?

If you need to contact us for any issue or assistance, you can do so online by filling out the online Contact Form, emailing us at or calling us on +44(0)1305 824 555. If it's about a purchase you've made for us please also include your order number.

Our brick-and-mortar store Underwater Explorers based on Portland, Dorset is staffed 7 days a week, including weekends and bank holidays. As it's an active store visited by divers from around the country and world regularly, if we can't make it to the phone for any reason please leave a message and we'll get back to you asap.

Any queries are usually answered the very same day and at most within 24 hours.


Why Portland?

We’re located on the Isle of Portland (in Dorset) because Portland has been one of the most popular scuba diving locations in the United Kingdom even before we set up operations here back in the year 2000.

On one side, we’re minutes away from the sheltered waters of Portland Marina and Harbour, while on the other, it’s just a brief walk to reach our famous scuba diving destination Chesil Cove and start of the 16-mile-long Chesil Beach.  

Portland’s location makes it ideal for scuba diving, freediving, snorkelling and other surface water sports activities. 

Check out how many wrecks we have around here by clicking on Scimitar Diving's Wreck & Dive Sites chart!

Alongside dive clubs, many instructors and dive schools travel here to train and offer scuba diving certification ranging from open water diver to mixed-gas tech diving or rebreather diving levels.

Whether you’re doing a boat dive from Portland Marina or Castletown or a shore dive at Chesil Cove, Portland is well known for offering many possibilities: Reef diving to wreck diving and night diving, underwater photography or underwater videography. Anything other than cave diving is possible here.

Likely being the best-stocked diving shop in the UK, at Underwater Explorers we offer in-store scuba diving equipment advice and sales, as well as gas fills, to locals and visitors (read About Us).

But... If you’re googling “scuba diving shop near me” like some, look no further, there's DirDirect online.

Here at DirDirect, we list our cutting-edge equipment for worldwide delivery and we’ve got you covered whatever your level of diving: We’re your local dive store wherever you are in the world.

All that with over 20 years of experience especially in technical diving, from training to equipment, advice and sales.


Underwater Explorers, Unit 1, Maritime Business Centre
Mereside, Portland, Dorset, DT5 1FD


The first “Green” regulator ever designed, the Atomic ST1 Regulator is made of a special grade of 316 Stainless Steel that is 100% recyclable. The ST1 offers superior corrosion resistance and does not require Chrome or Nickel-plating processes that create environmental concerns.

ST1 Stainless Steel & Titanium Regulator

At Atomic, it’s all about the metals. The 316 Stainless Steel used in the Atomic ST1 Regulator has twice the strength of brass with the durability of Titanium. It delivers virtually the same corrosion resistance as Titanium at a lower price.

Environmental experts have classified Stainless Steel as the Green metal of the future because of its strength, ability to resist corrosion and ability to be recycled.

The Atomic ST1 Regulator is designed to breathe effortlessly at atmospheres below the surface while helping preserve the atmosphere above.

Titanium Second Stage components

While the first stage is a beautiful, bright-turned machine finish that will last a lifetime, the ST1 is corrosion-resistant inside and out. The same Titanium second stage components used in the T3 are used in the ST1.

Easy breathing is delivered by the patented Titanium Seat Saving Dynamic Orifice and balanced poppet, case and lever design. The ST1 is Nitrox-ready up to 40%.

Comfort Swivel

The ST1 second stage offers the same renowned Atomic designs as the T3, including the patented AFC Automatic Flow Control with Rapid Adjustment Knob. A Stainless Steel Comfort Swivel hose allows a 30°effortless range of motion without pulling or binding.

Environmentally conscious topside natural breathing at depth

The Atomic ST1 Regulator is another industry first from Atomic Aquatics. The first stage is beautifully machined from a special grade 316 Stainless Steel that is twice the strength of brass with corrosion-resistance approaching Titanium.

The use of Stainless Steel means Atomic is doing its part for clean air when divers are out of the water. The legendary Atomic design means divers also breathe easily at depth.

Jet Seat Piston

The Atomic Jet Seat system has no sharp edges that can damage the seat over time. Instead, Atomic employs a conical seat and blunt-end piston.

Atomic 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.

Atomic ST1 Regulator specifications

All this Stainless Steel durability weighs just 2.3 pounds (yoke version), making the ST1 an excellent travel companion.

ST1 First Stage

  • Beautifully machined from a special Atomic grade solid 316 SS.
  • Atomic exclusive balanced Jet Seat high-flow piston.
  • Freeze-protected and factory-sealed to prevent outside contamination from silt and sand.
  • Nitrox ready – approved for non-dedicated EAN use with mixtures up to 40%.
  • Ports: 2 HP fixed / 5 LP on swivel cap

ST1 Second Stage

  • Pneumatically-balanced poppet, high-flow case and lever design for easy breathing at all depths and tank pressures.
  • Patented Atomic AFC – Automatic Flow Control.
  • Soft over-moulded Rapid Adjustment Knob for manual detuning in special situations such as surf entries or octo use.
  • Patented Atomic Titanium Seat Saving Dynamic Orifice maintains crisp, like-new factory tuning and prevents damage during storage.
  • Hose features patented Stainless Steel Atomic Comfort Swivel with Black PVD coating.
  • Dual material second stage cover enables the entire front to be purged.
  • Elliptical exhaust valve dramatically reduces exhalation effort at depth.
  • Dual silicone comfort fit mouthpiece with tear-resistant bite tabs – both comfortable and durable.
SKU: 03-0060-7P