What is the term for the main structure of a portable fire extinguisher?

The term for the main structure of a portable fire extinguisher is the cylinder. This cylindrical container holds the extinguishing agent under pressure and is a crucial component in the overall functionality of the extinguisher. The cylinder is designed to endure high pressure, ensuring that the extinguishing agent can be effectively discharged when needed. The integrity and strength of the cylinder are vital for safety, as it must withstand various conditions while containing the agent until it is deployed.

Other components, like the bell, handle, and valve, serve important roles as well, such as aiding in operation and controlling the flow of the extinguishing agent, but the cylinder is the primary body that houses and protects the agent. Understanding the cylinder's role helps emphasize the importance of maintaining and inspecting it to ensure proper function in emergency situations.