A pipe bushing is a type of fitting used in plumbing and piping systems. It’s designed to join pipes of different sizes together. Essentially, it’s a coupling device that connects a larger pipe to a smaller one or vice versa. Bushings typically have threaded ends to facilitate installation, and they come in various materials such as brass, stainless steel, PVC, or copper, depending on the specific requirements of the application. They’re commonly used in situations where a reduction in pipe size is needed, such as transitioning from a larger main supply line to smaller branch lines, or for adapting different types of piping materials.