What components make up a flareless tube fitting?

A flareless tube fitting is specifically designed to connect two pieces of tubing without needing a flare at the end of the tube, which simplifies installation and maintenance. The primary components of a flareless tube fitting include a nut and a sleeve, also known as a ferrule.

The sleeve fits over the tube and, when the nut is tightened, it compresses against the tube to create a secure seal. This design is advantageous in applications where high-pressure integrity is necessary. The nut allows for easy adjustment and ensures a tight fit, contributing to the overall reliability of the connection in hydraulic and pneumatic systems.

The other options presented do not accurately characterize the essential parts of a flareless tube fitting, emphasizing the importance of understanding the correct components for proper assembly and function in aviation maintenance applications.