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Oxygen closed circuit rebreather design is the simpelst type of rebreather. One of the designs works with no constant flow and no overpressure valve in the breathing loop. The demand valve for oxygen addition into the loop is triggered by diver`s oxygen metabolic consumption or is manual operated. No inert gas into the loop, no decompression obligation. Dive time is limited by oxygen exposure limits. MOD based on oxygen. Properly used its works truly bubble free. This is the only fully closed circuit rebreather design.
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