How is the primer activated?

The primer is activated by pushing the lever on the pump panel because this mechanism is designed to facilitate the priming process of the fire pump, ensuring that there is proper water flow when the pump starts. The operation of the primer through a lever allows for a quick and efficient means of removing air from the pump casing, which is essential for optimal performance.

Using a lever on the pump panel provides the operator with direct control during critical moments, ensuring that the primer can be activated as needed to maintain proper suction and enhance the pump's overall functionality. This hands-on approach is vital in emergency situations where speed and reliability are essential for effective firefighting operations. Other methods, such as turning a switch or key, may not offer the same level of immediacy or direct control necessary for effective pump operation.