What is the purpose of using Teflon tape on threaded connections?

Using Teflon tape on threaded connections serves the primary purpose of creating a leak-proof seal between the threaded surfaces. When Teflon tape is wrapped around the threads of a pipe or fitting, it fills any small gaps or irregularities that may exist in the threads, which helps prevent the escape of fluids or gases. This sealing property is essential in piping systems where pressure is involved, as leaks can lead to system failure, environmental hazards, or safety concerns.

While options such as providing a decorative finish or strengthening the joint may appear appealing, they do not accurately capture the essential functional purpose of Teflon tape. Similarly, although Teflon tape can have some resistance to corrosion due to its material properties, its most critical role is in sealing connections to ensure they remain watertight or gas-tight under pressure. Hence, the use of Teflon tape significantly enhances the reliability and safety of threaded connections in piping systems.