Instrument Fitter Practice Test – Prep, Practice Exam & Study Guide

When using Teflon tape on left-handed threads, the tape should be wrapped counterclockwise. This is important because left-handed threads are designed to tighten in the opposite direction of standard (right-handed) threads. When you wrap the tape counterclockwise, it follows the thread's direction, ensuring that the tape lays flat against the threads and does not unravel when the fitting is tightened.

If the tape were wrapped clockwise, it would unravel when the fitting is turned, leading to potential leaks and ineffective sealing. Teflon tape is specifically designed to fill gaps and provide a good seal in threaded connections, and proper application is crucial for it to function effectively, especially in left-handed thread scenarios.