Aqua Lung Leg3nd MBS Regulator
Aqualung Leg3nd MBS Regulator
Aqualung Leg3nd MBS Regulator
Aqualung Leg3nd MBS Regulator
Aqualung Leg3nd MBS Regulator

Aqualung Leg3nd MBS Regulator

Sale price£673.00 Regular price£748.00
Save £75.00

Aqualung Leg3nd MBS Regulator offers a revolutionary combination of the Venturi effect and inhalation effort adjustment, which feels natural. The Master Breathing System allows divers to fine-tune their breathing.

DIN or A-Clamp?

DIN or A-Clamp?


Special Order

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


Aqualung Leg3nd MBS Regulator offers a revolutionary combination of the Venturi effect and inhalation effort adjustment that feels natural and intuitive.

The Master Breathing System (MBS) allows divers to fine-tune their breathing in one simple rotation of the control knob. The MBS will adapt to all depths, conditions, and dives.

Aqualung Leg3nd MBS Regulator includes

Aqualung Leg3nd 1st stage (DIN or A-clamp)
Aqualung Leg3nd MBS 2nd Stage
Aqua Flex Regulator Hose

Leg3nd MBS Second Stage

The Leg3nd MBS has a simple and intuitive control system that controls both the Venturi effect and the inhalation effort adjustment in one turn of the knob.

New front cover opening channels allow water to flow sideways over the diaphragm. Radial openings to prevent freeflows when diving in stronger currents. Openings widened to reduce peak inspiratory flow by an impressive 20%.

New over-moulded exhaust cover made of elastomer with a “soft touch” effect.

The over-moulded air purge with a wide surface area makes regulator purging easier. The purge depth controller optimises airflow with minimal effort.

A patented Comfobite mouthpiece reduces jaw fatigue and secures the second stage more comfortably. The detachable and reusable mouthpiece clamp allows a quick, simple, tool-free mouthpiece change without plastic waste.

The enlarged heat exchanger helps to prevent freezing of the second stage mechanism.

The air channel deflector directs the airflow evenly during the inhalation phase. Streamlined bi-material deflector lowers the exhalation effort.

Leg3nd First Stage

When the first stage is not connected to a cylinder valve, the Auto Closure Device (ACD) keeps the inlet shut to protect the first-stage internal parts from contamination and corrosive water. This preserves the internal lubrication, keeps the inlet filter clean and dry and is safer for elevated percentages of oxygen.

Where there's no moisture, there's no ice. Exceptional cold-water performance is achieved by modernising Aqualung's three anti-freeze properties.

The Leg3nd's integrated dry chamber keeps inner components clean and dry by isolating them from the outside environment. Deep ribs create a large heat exchange surface area that helps to prevent ice from forming on the mechanism. The new over-moulded cap delays ice forming over the external diaphragm.

Auto-Balanced (also known as Over-Balanced) diaphragm for superior performance. Progressive increase of the working pressure to maintain optimum breathing efforts. Depending on the diver's depth, the working pressure of the first stage is automatically elevated to counteract the increased breathing air density.

Ergonomically shaped DIN and YOKE screws made of a bi-material “Soft Grip” surface provide a better hold when installing or removing the first stage – especially with cold hands. Channelled YOKE screw to prevent water retention. Specialised ACD Dust cap attached to the regulator body to protect the inlet fitting and the ACD system from impacts or damage

Perfectly positioned HP and MP ports provide optimal hose routing.

SKU: RG148003