Apeks Nitrox XL4

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Apeks Nitrox range of regulators opens up the most extreme of dive environments allowing you to explore the deeps for longer and enjoy extended bottom times. Apeks Nitrox XL4 is a compact, lightweight regulator designed to handle to abuse of regular technical diving.

Free UK Delivery

Apeks Nitrox range of regulators opens up the most extreme of dive environments allowing you to explore the deeps for longer and enjoy extended bottom times. Apeks Nitrox XL4 is a compact, lightweight regulator designed to handle to abuse of regular technical diving.

Apeks Nitrox XL4

Apeks Nitrox range of regulators opens up the most extreme of dive environments. They let you dive for longer and enjoy extended bottom times. But what is Nitrox?
Nitrox is the name for a wide range of gas mixtures with an oxygen concentration higher than the standard 21%. Because there is less nitrogen in the mix the chance of decompression sickness is reduced allowing you to explore the depths for longer.

Apeks Nitrox XL4 is a compact, lightweight technical regulator designed to handle to abuse of regular diving. The body of the DB4 1st stage is forged from a single piece of chromed brass, while the XL4 2nd stage constructed using the latest of composite technology ensuring it’s resistant to damage and tremendously light.

The DB4 1st Stage is environmentally sealed. This prevents ice buildup in the system allowing it perform flawlessly in cold environments; it also protects contaminants such as bacteria gets in and spoiling your air supply.

As you’d expect from Apeks the Nitrox XL4 is kitted out for technical diving. The overbalanced diaphragm allows the XL4 to perform well in deep water by counteracting the effects of ambient water pressure on your hoses.

The XL4 2nd Stage is pneumatically balanced for consistent and effortless breathing throughout your dive. The diver controllable venturi switch allows you to safely prevent free flow ensuring you don’t waste air when not using the regulator.

The Comfo-Bite mouthpiece features a bridge that sits across your palate. This provides support for the 2nd stage, reducing stress on your jaw and eliminates dry mouth.

Unlike many nitrox regulators, the Nitrox XL4 has been rigorously oxygen cleaned, meaning you can use nitrox blends beyond the 40% limit typical of most dives. In Europe, the Apex Nitrox Regulators are sold with an M26 connection

Do not attempt to use any Nitrox Product until you have obtained training in nitrox use with mixtures containing over 21% 02 from a nationally recognised training agency.


  • Nitrox Compatible - While many of regulators are able to support low concentration nitrox blends the Apeks Nitrox XL4 has been oxygen cleaned - a complex a rigorous procedure that must be undertaken is incredibly clean labs. This allows it use 100% oxygen nitrox blends, enough for the most advanced divers!

Apeks Nitrox DB4 1st Stage

  • Light & Compact - The Apeks Nitrox XL4 Weighs only 905g (DIN) and 1041g (Yoke) making it an exceptionally light and compact regulator set.
  • Robust - The DB4 is forged from a single piece of chromed marine brass. It’ll easily handle day to day dive abuse for years to come.
  • Cold water Ready - The DB4 1st stage is environmentally sealed, this prevents ice buildup within the 1st stage allowing it to perform flawlessly is cold water.
  • Over-Moulded End Cap - In the worst case, ice build-up can cause your 1st Stage to free flow, wasting your oxygen. The over-moulded End Cap extracts heat from the surrounding water helping to further protect
  • Over-Balanced Diaphragm - The DB4 over-balanced design is made to function perfectly with the XL4’s balanced design making it incredibly capable in deep water. As you descend the water pressure increases around you resistant the flow of air through your hoses. This over-balanced design increases the rate of airflow ensuring your breathing remains clear and consistent no matter how deep you dive.
  • Environmentally Sealed - The DB4 is environmentally sealed, not only does this help to reduce ice-buildup but prevents contaminants like silt or bacteria spoiling your air supply.
  • 4LP Ports, 1HP Port - The Apeks DB4 1st stage features 4 low pressure and 1 high-pressure port allowing you to connect up all of your dive gear.
    • 1 High-Pressure Port 1 (7/16" UNF)
    • 4 Low-Pressure Port 4 (3/8" UNF)

Apeks Nitrox XL4 2nd Stage

  • Pneumatically Balanced - The Nitrox XL4’s pneumatically balanced design ensures that even your tank is running low on pressure breathing is just as easy as the first breath.
  • Ease-of Breathing Switch - The XL4 2nd stage features a venturi switch. This allows you to control the free flow of air limiting wastage when you’re not using the regulator.
  • Flexible Nylon Braided Hose - Tougher and more flexible than standard rubber hoses, Nylon braided hoses offer improved flow of air. This mitigates the effect of increased water pressure on your hoses.
  • Large Purge Button - The large over-moulded self-flushing and controllable purge button is tough and easy to use.
  • Bubble Dispersion - The exhausts vents bubbles efficient
  • Comfo-Bite Mouthpiece - The Comfo-Bite Mouthpiece is super comfortable thanks to it high quality silicone compound. It features a bridge that sits across your palate preventing it from drying out.
  • Reusable Mouthpiece Clip - The mouthpiece clip is reusable so you can quickly replace your mouthpiece at the dive site.
  • Cold Water Ready - The XL4 is suitable in cold water below 10*C/50*F

Who is the Apeks Nitrox XL4 For?

The Nitrox XL4 is designed to be versatile. It’s light, performs equally well in ice cold - or warm water and is exceptionally well priced for such a technically capable regulator. If you’re looking for a lightweight piece of equipment to dive around the UK it’s the ideal choice; because of how light it is, however, it’s easy enough to transport abroad for diving in warmer climates)

Nitrox offers a number of benefits over standard oxygen mixes, though it’s not without risks and challenges. Do not attempt to use Nitrox mixes without first receiving training from a professional diving trainer.

Who are Apeks?

Well known for their design and manufacturing of high quality breathing apparatus, Apeks supply more UK divers with regulators than any other dive manufacturer. Apeks has grown to become one of the benchmarks of the industry with superior standards in both engineering and design. Innovative development of not only their regulators but other diving equipment, Apeks offer a lifetime guarantee on all of their equipment, a testimony to the reliability and quality.

Apeks Nitrox XL4 Specification
Connections M26 and DIN available
Type of first stage Over-balanced diaphragm design, environmentally sealed
Body Type One piece forged body
Number of HP ports 1 (7/16" UNF)
Number of MP ports 4 (3/8" UNF)
Environmental Dry Kit Standard
First stage exterior Satin
Orientation Convertible LH or RH
Coldwater Use Yes
Type of second stage Pneumatically balanced
Opening Effort Control Knob No
Integrated Venturi Lever Yes
Mouthpiece Comfo-bite™
Exhaust tee Standard, one set
Heat Exchanger for freezing resistance Yes
Hose type Braided Flexi-hose
Overall work of breathing (WOB) scores Avg. 0.90 joules/liter
Nitrox compatible Yes.
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