To operate a carbon dioxide extinguisher having the type of head shown in the illustration, you would __________. SF-0008

Correct Answer: Option B — pull pin and open valve

Operating a standard CO2 extinguisher requires removing the safety pin to unlock the handle, followed by opening the valve to release the pressurized gas. The pin acts as a mechanical interlock to prevent accidental discharge. Once the pin is removed and the valve is opened, the agent flows through the discharge horn.