Which part of a fire extinguisher is responsible for discharging the extinguishing agent?

The handle of a fire extinguisher is responsible for discharging the extinguishing agent. When the handle is squeezed or pressed, it activates the internal mechanism of the extinguisher, allowing the pressurized extinguishing agent to flow out through the nozzle. This action releases the agent at high velocity, enabling the user to effectively target the fire and suppress it.

The nozzle is designed to direct the flow of the extinguishing agent, but it cannot initiate the discharge without the action taken at the handle. The gauge indicates the pressure level and readiness of the extinguisher, while the hose is used to convey the agent to the nozzle in some types of extinguishers. However, none of these components directly initiate the discharge; that function resides solely with the handle.