Red Seal Plumbing Practice Exam

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What is usually indicated by the line around the nut on an acetylene fitting?

Right-hand thread
Left-hand thread
Damaged thread
Standard thread

The correct answer is: Left-hand thread

The line around the nut on an acetylene fitting usually indicates that the fitting has a left-hand thread. This is important to know so that the fitting can be properly tightened and secured onto the acetylene tank without causing damage. Options A, C, and D are incorrect because a line on the nut does not indicate a right-hand thread, damaged thread, or standard thread. It is specifically used to indicate a left-hand thread in the case of acetylene fittings.