What is the purpose of a pipe plug?

A pipe plug serves the essential function of closing the end of a pipe that has inside threads. This is typically done to seal off the pipe, preventing the flow of liquids or gases. By using a pipe plug, you ensure that the piping system is secure and maintains appropriate pressure, which is particularly important in both plumbing and industrial applications.

The design of a pipe plug, with its internal threads, allows it to be easily screwed into place, ensuring a tight fit and reliable closure. This is crucial when a pipe is not intended to carry fluid or when maintenance or modifications are necessary. The proper use of a pipe plug can also facilitate pressure testing and can help to prevent leaks.

In terms of other options, while joining pipes, reducing their size, and creating turns are important functions in plumbing and piping, they do not pertain to the specific purpose and design of a pipe plug. This highlights the unique role of a pipe plug as a sealing component in a piping system.