The O2ptima CM incorporates a chest-mounted, dual counterlung design. The breathing loop consists of the DSV, breathing hoses and hose fittings, inhalation and exhalation counterlungs, scrubber canister, canister end cap, and electronics head.
Gas flows from the diver → to the right counterlung → through the scrubber canister → to the left counterlung → back to the diver.
