With the ExtendAir cartridge installed or the scrubber packed, the next step is to install the canister onto the bottom of the counterlungs. It should be oriented with the electronics head on the diver’s left and the endcap on the diver’s right (See Figure 19).
With the canister in place, confirm that the fitting O-rings are present, clean, and lightly lubricated. Press the fittings into place, and then tighten the threaded rings. (See Figure 20).
