Which of the following is not considered an advantage of piston pumps?

Maneuverability is not considered an advantage of piston pumps primarily because these pumps are typically heavier and bulkier compared to other types, such as diaphragm pumps. Piston pumps use a piston to create pressure, which can make them less portable and harder to handle in tight or confined spaces.

On the other hand, the other options highlight characteristics that illustrate the strengths of piston pumps. The design of piston pumps allows for minimal internal leakage, enhancing efficiency and performance. Their output is consistent across various pressures, which is essential for maintaining proper application rates in pest control. Additionally, they are often designed for low maintenance, reducing the overall operating costs for users managing pest control applications. Understanding these aspects helps in recognizing the limitations and advantages of different pump types in structural pest control.