Atomic M1 Regulator
Atomic M1 Regulator
Atomic M1 Regulator
Atomic M1 Regulator
Atomic M1 Regulator

Atomic M1 Regulator

Sale price£786.00

The Atomic M1 Regulator has an expanded performance range to meet almost any diving condition. Caves, cold, deep, nitrox – the M1 is perfect for divers ready to extend their capabilities or accomplished technical divers.

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 Atomic M1 Regulator has an expanded performance range to meet almost any diving condition imaginable. Caves, cold, deep, enriched air – the M1 is perfect for recreational divers ready to extend their capabilities or accomplished technical divers.

Pair it with Atomic M1 Octopus.

Atomic M1 Regulator

M1 Monel Regulator

Atomic metallurgy expertise drives Atomic to design the M1 Regulator for extreme diving. Monel parts are used internally in the first stage for high strength, corrosion resistance and oxygen compatibility.

316 Stainless Steel, multi-layer Zirconium-coated Brass, and Titanium are used throughout the second stage.

The M1 valve body is Zirconium/Nickel over Brass, and the Seat Saving Dynamic Orifice is Stainless Steel. The M1 is factory-ready for EAN mixtures up to 50% or Oxygen mixes up to 80% when special guidelines are followed.

Environmentally Sealed

The M1 first stage is chrome-plated brass and environmentally sealed at the factory to encase key internal components made of Monel.

The second stage features a thermal heat sink for cold water, a surge-protected front cover, and a super-dry exhaust valve for rough water. Add a super-wide exhaust deflector and an exclusive Atomic engraved heat-protecting jam nut for freeze protection to cover almost any extreme diving situation.

Radical Design

The Atomic M1 Regulator design includes the same Atomic ergonomic and performance features that rocked the dive world. Patented Atomic exclusives like the balanced Jet Seat high-flow first-stage piston and second-stage AFC Automatic Flow Control with Rapid Adjustment Knob combine to make the M1 both extreme and extraordinary.

Designed for Challenging Conditions

The Atomic M1 Regulator has an expanded performance range to meet almost any diving condition imaginable, whether Recreational or Technical. Accomplished specialty divers will appreciate this regulator designed to fulfil virtually any need or diving scenario. The M1 is built on the same platform as the world-acclaimed Atomic T2 and B2 regulators.

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 M1 Regulator specifications

It’s a beast in the water, but not a burden for divers with 2.6 pounds first and second stage combined weight (yoke version).

M1 First Stage

  • Factory ready for Nitrox to 50% or Oxygen mixes to 80% when special guidelines are followed.
  • Chrome-plated Brass body and Monel key internal components.
  • Atomic exclusive balanced Jet Seat high-flow piston.
  • Freeze-protected and factory-sealed to prevent outside contamination from silt and sand.
  • Ports: 2 HP fixed / 5 LP on swivel cap

M1 Second Stage

  • Designed for cold water diving featuring a thermal heat sink and super-dry exhaust valve.
  • Components made of precision-machined Brass with Zirconium plating and Titanium.
  • Patented Atomic Stainless Steel Seat Saving Dynamic Orifice maintains crisp, like-new factory tuning and prevents damage during storage.
  • 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.
  • High-flow second-stage case and lever design for easy breathing at all depths and tank pressures.
  • Surge-protected front cover for high current scenarios.
  • Super-wide exhaust deflector to disperse bubbles for enhanced visibility.
  • Dual silicone comfort fit mouthpiece with tear-resistant bite tabs – both comfortable and durable.
SKU: 03-0030-7P