During routine inspection, which condition should prompt immediate action for a Class K extinguisher?

• A. Freshly painted exterior
• B. Slight dust on the surface
• C. New sticker label
• D. Corroded components

Answer: (D)

Corrosion on any extinguisher component signals a loss of integrity that can lead to leakage or failure to discharge when needed. In a Class K extinguisher, which contains pressurized agents for commercial kitchens, corrosion can affect the cylinder, valve, or hose and compromise performance in a real fire. Because of this, signs of corrosion should prompt immediate action: remove the unit from service, tag it, and arrange maintenance or replacement per the applicable standards. Cosmetic issues like fresh paint, light surface dust, or a new label do not by themselves affect operability, though they should not mask hidden damage. Regular inspections should always verify there are no signs of corrosion or other damage.