🔍 Key Concepts

• Cartridge-operated fire extinguisher parts shown in the cutaway (gas pressure cartridge, puncture lever, hose nozzle) • The difference between pressurizing the cylinder and controlling the discharge • Sequence of actions normally required: unlock safety device, puncture the gas cartridge, then open the nozzle to discharge

💭 Think About

• From the illustration, which specific action actually causes the gas cartridge to release pressure into the main cylinder? • Which part of the extinguisher controls the start/stop of the agent flow once the unit is already pressurized? • Looking at the labeled parts, which choice lists the actions in a realistic, safe operating sequence for this style of extinguisher?

✅ Before You Answer

• Identify which step in each option corresponds to puncturing the gas pressure cartridge using the labeled puncture lever and cartridge guard • Confirm that the action that operates the extinguisher agent flow involves the nozzle or valve at the hose end • Eliminate any options that describe turning or tightening parts not shown or not labeled in the illustration (for example, anything about a vent cap)