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Speaking of setting off the system, remember I said that the actuator rotates when you pull the T-handle? Well, in this picture you can see the brass arm that it rotates around. A CO2 cartridge will screw into the end of that bracket closest to the actuator. Inside the actuator, there is an oversized needle which, when the T-handle is pulled, punctures the CO2 cartridge, pressurizing the bottle.