What is the purpose of flaring copper tubing in plumbing connections?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

What is the purpose of flaring copper tubing in plumbing connections?

Explanation:
Flaring copper tubing creates a conical, seating end that the flare nut presses against to form a tight metal‑to‑metal seal. The 45° flare provides a smooth seating surface that, when the nut is tightened, is compressed against the fitting to stop leaks under pressure. This is why the flare end must be clean, square, and correctly angled—the seal relies on that precise shape. Flare is not about removing burrs, twisting the tubing, or measuring diameter, though those are separate steps in preparing a line.

Flaring copper tubing creates a conical, seating end that the flare nut presses against to form a tight metal‑to‑metal seal. The 45° flare provides a smooth seating surface that, when the nut is tightened, is compressed against the fitting to stop leaks under pressure. This is why the flare end must be clean, square, and correctly angled—the seal relies on that precise shape. Flare is not about removing burrs, twisting the tubing, or measuring diameter, though those are separate steps in preparing a line.

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