O-rings are the parts you never think about until one is cracked, stretched or sitting at the bottom of the rinse tank. This set covers the most common replacement O-rings for the Dive Rite CM O2ptima, better known as the Choptima, so you can keep your unit sealed up and ready instead of hunting for a match. We are an official CM CCR service center, so if there is a chest mount O2ptima part you do not see on the site, reach out and we can get you what you need. A spare set belongs in every rebreather diver's kit.
