O2ptima CM
 
The most versatile tool for underwater exploration.
The simplicity of the O2ptima CM results in limitless possibilities of use. The O2ptima CM is fully compatible with whatever open-circuit system you’re currently diving: sidemout, back mounted doubles, or a single tank. The chest-mounted design easily attaches to almost any harness using four bolt snaps. This rebreather can be quickly added or removed for any mission. Add it to your single tank rig for a deep ocean dive and remove it later for a shallow open circuit reef dive. Use it in place of a stage bottle to greatly extend your penetration distance in an overhead environment. Remove and stage it underwater for later decompression or to navigate tight restrictions… The possibilities are endless and the O2ptima CM has been used for cutting edge exploration and world class expeditions all over the globe.
 
The O2ptima CM shares many of the features that have made the back-mounted O2ptima great for years:
The CM is a fully electronically controlled closed circuit rebreather (eCCR) using state-of-the-art Shearwater electronics.
The breathing loop is one of the shortest of any rebreather on the market.
The unique scrubber design is fully compatible with the MicroPore Extendair cartridge while also being packable using approximately 5 pounds (2.2 kg) of granular absorbent.
The dual counterlung design and 6 L total loop volume provides incredibly low work of breathing in a variety of diver orientations.
Compact design ideal for overhead diving and rugged enough for the toughest expeditions.
Threaded loop connections for easy removal of the scrubber and cleaning.
Made in USA
Redundant Shearwater DiveCAN electronics including Heads-Up Display (HUD) and Petrel 2 controller (NERD controller is optional)
Chest-mounted counterlungs with 6 L total loop volume
Dual use scrubber canister design can be used with Micropore ExtendAir SR-081C cartridges or packed with 5 lbs of 812 mesh loose granular CO2 absorbent
Dive Rite DSV standard
Oxygen Manual Add Valve (MAV) and Automatic Diluent Valve/Diluent Manual Add Valve (ADV/MAV)
Dual water traps inside the counterlungs and scrubber endcap
XT1 or FT1 first stage oxygen regulator
4 AI R22 Oxygen Sensors
SuperFabric soft cover for abrasion protection
12 in (30 cm) loop hoses standard, 10 in (25 cm) hoses optional
Compatible Cylinders (not included): AL 13 (recommended), AL 20, AA LP 27, AA HP 32, AA LP 13
Compatible with any harness with 2 high shoulder D-rings and 2 hip D-rings. Nomad LS recommended
Weight: 14.4 lbs without oxygen cylinder or scrubber material