4 upgrades I like for my O2ptima CM Rebreather.
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Scuba diving has significant risks. The information provided in this video is supplemental educational material and does not offer a complete educational experience for any dive activity. Scuba diving requires in-person training. Specialty and advanced areas of diving require specialty dive training, equipment, and experience. Always check with manufacturer recommendations before using or customizing equipment. Talk to a certified and qualified dive instructor for more information.