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APEKS DS4 1st stage DIN 300


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The DS4 offers a fully balanced first stage with cold water capability (can be used in all temperatures including those below 10 C / 50 F).

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181,82 €

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This high-performance regulator boasts an over-balanced first stage

Suitable for coldwater use thanks to its first stage environmental dry seal

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.
  • DIN 300 bar


  • Connections     DIN 300 bar
  • Type of first stage     Over-balanced diaphragm design, environmentally sealed
  • Body Type     Cylindrical with environmental dry seal (DS4)
  • 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
  • Heat Exchanger for freezing resistance     Yes
  • Weight     Yoke 1130g