What does a bushing do in an irrigation system?

A bushing is a type of fitting used in irrigation systems that allows for the connection of pipes or fittings of different sizes. Specifically, it reduces or enlarges the size of a fitting to accommodate varying pipe dimensions, effectively enabling a seamless transition between larger and smaller pipes or fittings in the system.

In practical terms, this means that when you have a larger pipe that needs to connect to a smaller pipe, or vice versa, a bushing provides the necessary interface to make that connection possible without compromising the integrity of the irrigation system. This adaptability is crucial for maintaining proper water flow, pressure, and overall efficiency of the irrigation system.

In contrast, the other options pertain to different functionalities that do not apply to a bushing. For example, adapting a fitting only to a larger size or concerns such as preventing backflow or providing water filtration are specific to other components within an irrigation system and not the function of a bushing. Thus, the correct understanding of a bushing's role within an irrigation system is its ability to adapt fittings to both larger and smaller sizes as needed.