Apeks ATX40, DS4 with ATX40 Octopus

Description

Apeks DS4 with ATX 40 Regulator & ATX 40 Octopus

Reliable. Durable. Cold Water Ready.

The Apeks DS4 with ATX 40 regulator and ATX 40 octopus is a proven, high-performance regulator set designed to meet the demands of recreational and technical divers alike. Built by Apeks—one of the most respected names in scuba diving gear—this system is a favorite among cold water divers and professionals around the world.

Why Choose the Apeks DS4 with ATX 40 Set?

• ✅ Cold Water Performance: The DS4 first stage is environmentally sealed to prevent freezing and contamination, making it ideal for cold or silty conditions.

• ✅ Smooth, Reliable Breathing: The pneumatically balanced ATX 40 second stage delivers consistent airflow at any depth or tank pressure.

• ✅ Robust & Compact: The DS4’s compact, unbalanced diaphragm design is durable and perfect for twinsets, stage bottles, or streamlined configurations.

• ✅ Backup Peace of Mind: The included ATX 40 octopus matches performance with reliability—an essential safety feature for any dive.

Key Features:

• Environmentally sealed DS4 first stage with 1 HP and 4 LP ports

• ATX 40 primary and octopus with Venturi adjustment for surface and depth control

• Lightweight and compact for reduced jaw fatigue

• Suitable for cold water, technical, sidemount, and stage diving

• CE approved for cold water use (below 10°C / 50°F)

Whether you’re diving in cold lakes, deep wrecks, or open ocean environments, the Apeks DS4 with ATX 40 Regulator Set delivers the performance and durability you need for peace of mind underwater.

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Shop now to experience why divers worldwide trust Apeks for their most challenging dives.

ATX

• This high-performance regulator boasts an over-balanced first stage coupled with a pneumatically balanced second stage.
• The smooth, quiet breath is sure to enhance your diving enjoyment.
• Suitable for coldwater use thanks to its first stage environmental dry seal and second stage heat exchanger.
• Compatible with EAN40 out of the box.

First Stage:

• Uses the DS4 first stage
• Unique over-balanced, diaphragm design – as the diver descends, the over-balancing feature allows the medium pressure gas in the hose to increase at a rate faster than ambient. This results in superior performance at depth.
• 1 HP port and 4 MP ports are available.
• An environmental dry system keeps water out of the main spring chamber thus preventing ice buildup and keeping silt and contamination out.
• A Clamp or DIN configuration.

Second Stage:

• Pneumatically-balanced second stage results in smooth, easy breathing.
• The large purge button on the ATX is easy to operate even with thick gloves.
• The integrated venturi control provides a performance boost at depth while preventing unwanted freeflow at the surface.
• An extremely efficient exhaust valve improves the breathing performance of the regulator.
• The Comfo-bite™ mouthpiece virtually eliminates jaw-fatigue.
• A heat exchanger (patented) which surrounds the valve mechanism, dissipates the cold caused by gas expansion while drawing in the warmth of the ambient water.
• Offers a compact, integrated exhaust tee.

ATX40 Octopus

• The XTX purge buttons are large and easy to operate. A 2-stage progressive purge is used. Press the purge on the side for a lower flow rate, useful where more control is required such as filling lift bags etc, then press in the centre for the full effect of the purge, i.e. when regulator clearing etc.
• Can be converted from a right-handed hose configuration to a left handed one. The process of changing the regulator to a left-handed configuration is both quick and simple. However, this procedure must ONLY be performed by an APEKS Authorised Service Technician.
• Compatible with EAN40 out of the box.
• Pneumatically-balanced second stage results in smooth, easy breathing.
• The large venturi lever has a soft touch rubber grip, which makes it easier to locate and use. The lever reduces the amount of grit ingress and therefore resists any possible friction giving a smooth operation.
• The Octopus is manufactured with active protection against infection as all moulded parts are produced with an additive that kills MRSA, protects against E-Coli, bacteria and fungi, and is also very effective against viruses, mould, yeast and algae.
• A silicone exhaust valve improves the breathing performance of the regulator.
• The Comfo-bite™ mouthpiece virtually eliminates jaw-fatigue
• Suitable for cold water use (below 10 C / 50 F).