ApeksDS4 Nitrox First Stage Only

These first stages utilize a unique over-tracking (over-balanced) diaphragm design, where the intermediate pressure supplied to the second stage increases more than traditional balanced models, as the diver descends to greater depths. This increased intermediate pressure compensates for the increased density of your breathing gas by allowing a larger volume of gas to flow through the system on demand. The result is superior breathing performance regardless of depth. The over-tracking diaphragm design is found on Apeks Black Pearl, ATX 200, ATX/TX100, ATX/TX50, ATX/TX40, and TX40/DS4 first stages. Diaphragm first stages have a number of advantages over piston type first stages, especially when combined with Apeks Dry Sealed System*. They offer outstanding gas flow, easy maintenance, simple adjustment of intermediate pressure and a sealed mechanism totally protected from all types of contamination and freezing.
 

 The performance and internal workings are the same as a TX40/50 1st stage, but this unit has no swivelling turret, thus making it a more compact unit. And having the APEKS dryseal system is ideal for cold water diving or warm water diving. 

Apeks DS4 1st stage only DIN Nitrox (use above 40%) - 40. THIS IS M26 DIN FITTING .. M26 ADAPTOR CONVERTING TO 5/8 BSP THREAD IS AVAILABLE.