Apeks ATX40 DS4 Regulator

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  • Description

    This Apeks ATX40 / DS4 Regulator is a high-performance regulator, which boasts an over-balanced first stage coupled with a pneumatically balanced second stage and a diver adjustable venturi.

    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.

    The ATX40 is extremely light (25% lighter than the TX models) and the special mouthpieces reduces jaw fatigue.

    Compatible with EAN40 out of the box.

    A stylish look further enhances the value of this regulator.

  • Features

    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.
    • Available in DIN and yoke.

    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.
  • Specifications
    Type of first stage Over-balanced diaphragm, environmentally sealed
    Body Type Cylindrical
    Number of HP ports 1 (7/16" UNF)
    Number of MP ports 4 (3/8" UNF)
    Environmental Dry Kit Standard
    First stage exterior Chrome over marine brass
    Coldwater Use Yes
    Type of second stage Pneumatically balanced
    Integrated Venturi Lever Yes
    Mouthpiece Comfo-bite™
    Exhaust tee Diver Changeable - comes with 2 sets
    Heat Exchanger Yes
    Overall work of breathing (WOB) Avg. 0.85 joules/liter
    Nitrox compatible 40% out of the box
  • Reviews
  • Returns


    If you change your mind, it doesn’t fit, or you become inflicted with buyer’s regret - that's OK!

    Mike's Dive Store offer an extended returns policy of 30 days - so you can be rest assured if the suit, piece of diving equipment or gift doesn't suit then just send it back and we will either exchange it or offer a full refund less any postage costs. Too easy!

    Please note that there are some special order items on our website that will be subject to a 20% re-stocking fee but we will let you know about these items before we special order them so that you are aware of this. If this is the case we can always help with correct sizing so that we minimise the risk of return.

    For step-by-step instructions click here