Hollis DC7 1st Stage


High performance, over-balanced first stage.

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Hollis’ high performance over-balanced first stages provide progressively greater intermediate pressure as depth and gas density increases. The center “pads” that the diaphragms act against are different sizes so the working area of the outer environmental diaphragm is larger than the working area of the inner diaphragm. As depth increases, more pressure is applied to the larger surface area of the outer diaphragm than would be applied to the internal diaphragm. The result is superior gas delivery under the most extreme conditions.


  • Fixed hose routing ideal for both backmount and sidemount configurations
  • Environmental sealing prevents internal corrosion, contaminants, and icing of the first stage
  • Withstands rigorous CE standard for coldwater performance
  • Nitrox compatible to 40%
  • 2 HP and 4 LP
  • DIN/300 bar


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