DGX Custom - Apeks DS4/XTX40 O2/Stage Reg Package

In Stock
This Apeks brand regulator is suitable for use with breathing gases containing up to 100% Oxygen. This compatibility coupled with its excellent reliability and performance make it the choice for technical divers doing high O2 percentage deco stops or staging at extreme depths.
This regulator has the typical BSP G5/8 DIN connector that will fit 200 Bar and 300 Bar valves. It will NOT fit the M26X2 Nitrox/Oxygen valve outlet mandated ONLY in the European Union by the EN 144-3:2003 standard.

DGX Custom - Apeks DS4/XTX40 O2/Stage Reg Package

DGX Custom - Apeks DS4/XTX40 O2 Reg Package
DGX Custom - Apeks DS4/XTX40 O2 Reg Package
  • Complete oxygen deco regulator configuration
  • Suitable for use with oxygen up to 100%
  • Includes DGX { 40 in | 1.0 m } LP Hose for the primary, plus button SPG
  • Assembled, tested and shipped to you ready-to-dive
  • Excellent tolerance of cold water

Compatibility with Oxygen percentages up to 100%, coupled with its proven reliability and performance make the Apeks DS4/XTX40 O2 Reg Package an excellent choice for technical divers doing high oxygen percentage accelerated decompression stops or staging at extreme depths. Green & yellow color cosmetics clearly identify that this regulator is dedicated for oxygen clean breathing gases. The package comes completely assembled by Dive Gear Express with our premium accessories and includes:

  • One Apeks DS4 first stage w/green accent
  • One Apeks XTX40 second stage w/green & yellow cosmetics
  • Comfo-bite™ mouthpiece and compact narrow exhaust tee
  • {40 in | 1 m} braided flex or rubber LP hose in green
  • Mini-SPG in PSI or BAR
  • S/S Bolt Snap & DIN Cap

The Apeks DS4 First Stage is a work horse with years of proven performance and reliability preferred by the most demanding technical divers. The Apeks DS4 is a unique over-balanced, diaphragm design - as the diver descends, the over-balancing feature allows the intermediate pressure gas in the hose to increase at a rate faster than ambient resulting in superb performance at extreme depths. The polished chrome plated body has one standard high pressure 7/16-inch hose port and four standard high-flow low pressure 3/8-inch hose ports in fixed orientation; popular for stage bottle configurations. An environmental seal keeps water out of the main spring chamber thus preventing ice buildup and keeping silt and contamination out.

For markets outside the EU the DS4 first stage in this oxygen package has the typical BSP G5/8 DIN connector with a solid green spacer and chrome handwheel that will fit 200 Bar and 300 Bar valves It will NOT fit the M26X2 Nitrox/Oxygen valve outlet mandated ONLY in the European Union by the EN 144-3:2003 standard. It is easy to distiquish the EU version: the M26X2 connector has an alternating yellow and green color handwheel.

The Apeks XTX40 second stage is a pneumatically-balanced design that results in smooth, easy breathing. The soft silicone front cover has a large and easy to operate purge button that features two-step progressive operation. Press the purge on the side for a lower flow rate (useful where more control is required such as filling lift bags) then press in the center for the full effect of the purge such as when clearing water. It also offers a large venturi (Dive /Pre-Dive) lever for better gas flow and to reduce free flow upon initial entry. A heat exchanger which surrounds the valve mechanism, dissipates the cold caused by gas expansion while drawing in the warmth of the ambient water. The popular Apeks Comfo-biteā„¢ mouthpiece by Aqualung greatly reduces jaw fatigue.

The XTX second stage design supports an innovative user changeable exhaust tee. This system gives the diver the ability to change between a narrow exhaust tee that makes the second stage more compact and a wide exhaust tee that offers the best bubble dispersion. The XTX second stages are also a reversible design that can be converted from a standard right-handed hose inlet configuration to an uncommon left-handed configuration. Apeks describes the process of reconfiguring the regulator to a left-handed hose inlet as both quick and simple, however they recommend this be done by a regulator technician.

Apeks brand regulators include a Limited Lifetime Warranty as long as they are inspected or serviced annually by an AQUALUNG AMERICA Authorized Dealer. This warranty covers the original owner against defects in parts or workmanship for the lifetime of the regulator and includes the Free-Parts-For-Life Program as outlined on their website.

More Information
Brand Apeks
SKU PK-791009
Weight 5.000000

Customer Reviews

Tek Tip Warning Image WARNING
According to our suppliers, their Nitrox Ready and Oxygen Service products are compatible with oxygen and factory cleaned for use with compressed gases in excess of 23.5% oxygen. Nonetheless, the 'clean state' of this equipment applies only prior to initial use. Thereafter, periodic inspection and cleaning are a necessity. You must meticulously follow the recommendations of the US Department of Transportation (DOT), Compressed Gas Association (CGA), and other federal/state/local agencies, plus your dive training agency for equipment maintenance, handling, storage, labeling, filling, transport and use of compressed gases. Oxygen-related fires and explosions can result in serious injury or death. Ultimately, you must make the final decision to assume all risks associated with the use of any compressed gases, including those in excess of 23.5% oxygen.


Regulators and Required-stop Accelerated Decompression

Open-circuit technical divers often switch to breathing pure oxygen or a very rich advanced Nitrox mix such as 50%, to substantially reduce their required-stop times as compared to decompressing using just their bottom mix, called accelerated decompression. The depth where the gas switch occurs is relatively shallow, typically {20 fsw | 6 msw} for 100% oxygen or { 70 fsw | 21 msw} for 50% Nitrox. For profiles with very deep and/or very long bottom times, the diver can further reduce their required-stop times with multiple gas switches during the ascent, sometimes called multi-staged accelerated decompression (not to be confused with regulator stages). The depths where the first gas switch occurs in multi-staged deco is relatively deep, typically {100 fsw | 30 msw} using a sport Nitrox mixture and for extreme exposures often the first switch is around {190 fsw | 57 msw} using normoxic Trimix.

Divers on decompression stops are normally at rest and decompression gas regulators are typically configured with only one second stage regulator. Required-stop decompression in general is not an activity that demands high-performance regulators, although it can be in physical overhead environments where the diver must also continue swimming towards an exit. The shallower accelerated decompression depths when using very oxygen rich breathing gases are not at all demanding of regulator performance, almost any regulator would do in theory, but the very rich decompression gas requires the regulator be specifically designated as suitable for use with pure oxygen. Unfortunately, most manufacturers only describe their regulators as suitable for Nitrox mixtures to 40% maximum.

Dive Gear Express offers several specialty decompression regulators all designed and qualified for use with breathing gas mixtures containing up to 100% oxygen, but each suitable for use in differing maximum depth ranges based on their performance. The Dive Rite O2 Regulator is suitable to a maximum depth of { 50 fsw | 15 msw}. The DGX Gears O2 Regulator is suitable to a depth of {130 fsw | 40 msw}. The Mares O2/Stage Regulators are suitable for use to a depth of {160 fsw | 50 msw}. The Dive Rite O2/Stage Regulator and the Apeks O2/Stage Regulator depth limits exceed {330 fsw | 100 msw}. For reasons of familiarity and ease of maintenance irrespective of cost, divers will sometimes choose to use deco regulator versions similar their primary even though their performance exceeds the demands of required-stop accelerated decompression.

Regardless of the capabilities of your regulator, the maximum depth of your dive is also limited by the amount of oxygen in the breathing gas and the partial pressure of oxygen at that depth.