caption: The image shows a diagram of a gas canister with its parts labeled, including the firing pin, trigger, and detonator. The canister is a cylindrical shape with a handle on the top and a nozzle at the bottom. The trigger is located on the side of the canister and the detonator is located in the center. The diagram also includes labels for the various components of the fire extinguisher, such as the trigger, the firing pins, and the ignition coil.