Which step should be performed first when making a single flare on a piece of tubing?

• A. Slip the fitting nut and sleeve on the tube
• B. Strike the plunger with a mallet
• C. Place the tube in the flaring block
• D. Tighten the clamp bar securely

Answer: (C)

The first step in making a single flare on a piece of tubing involves placing the tube in the flaring block. This step is crucial because the flaring block holds the tubing securely and provides a proper alignment for the tubing as it is shaped into a flare. By ensuring that the tube is correctly positioned, subsequent steps in the flaring process can be executed accurately, leading to a well-formed flare that is essential for creating a leak-free connection.

Once the tube is secured in the flaring block, the other steps follow naturally, but it's imperative to start with this placement to set up a solid foundation for the flare. Failing to properly secure the tube could lead to inaccuracies or improperly formed flares, ultimately affecting the integrity of the fitting.