How do you pressurize a cartridge type extinguisher?

To pressurize a cartridge-type extinguisher, first ensure it is empty and safe to handle. Remove the safety pin and nozzle, then attach the cartridge filled with the appropriate gas (usually CO2) to the designated valve. Once securely in place, activate the valve to release the gas into the extinguisher, which pressurizes the internal chamber. Finally, check for any leaks and ensure the pressure gauge indicates the proper operating range.