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Reg. Price: $499.95
Our Price: $475.00
on orders of $35.00 or more.
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Apeks ATX40/DS4 Balanced Yoke Regulator

Before the XTX became the regulator of choice, the ATX models ruled the seas.

The ATX40 is still made available today at an entry-level price. This excellent regulator offers a fully balanced first and second stage with coldwater capability. This product qualifies for Free Parts for Life


  • 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


  • 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


The Aqualung line of quality regulators  come with 1.)  limited lifetime warranty that will cover the original owner of the product against defects in parts or workmanship for the lifetime of the regulator as long as it is purchased from an authorized dealer (OnlineScuba is an authorized dealer) 2.) regulators are serviced annually by an authorized dealer.


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