Which type of fitting is identified as an AN flared-tube fitting?

The correct choice is the fitting that is identified as having a flared connection. AN flared-tube fittings are designed primarily for use in applications that require a strong, leak-resistant joint. The defining characteristic of AN fittings is their 37-degree flared design, which allows the tubing to create a tight seal when the fitting is tightened. This design enhances the fitting's capability to handle high-pressure situations, making it widely used in aviation and automotive applications.

The right choice highlights the significance of the flared connection, which is crucial for ensuring a secure and reliable joint that can withstand vibration and pressure fluctuations. This flared design allows the connection to provide maximum flow and minimizes turbulence, a key factor in hydraulic and pneumatic systems.

The other options refer to variations in fitting types and configurations that do not specifically describe the flared-tube design characteristic to AN fittings. While they may have specific uses in piping and fitting applications, they do not encapsulate the essential feature that makes a fitting an AN flared-tube fitting.