Which tool is used for adding length to a piece of pipe?

The tool used for adding length to a piece of pipe is the pipe nipple. A pipe nipple is a short piece of pipe that has threads on both ends, allowing it to be easily screwed onto two other pipes or fittings to extend their length. This makes it a versatile solution for connecting sections of piping and creating longer runs in plumbing systems or other applications.

Using a pipe nipple is beneficial because it creates a secure and leak-free connection between two sections of pipe, thereby facilitating the transport of fluids or gases without interruption. This tool is commonly used in various plumbing and industrial applications to modify the length of existing piping systems.

Other tools listed, such as a pipe reducer and pipe wrench, serve different functions. A pipe reducer is designed to connect two pipes of different diameters, reducing the size of the flow path rather than extending it. Meanwhile, a pipe wrench is primarily used for gripping and turning pipes but does not contribute to adding length. The piston ring compressor also serves a distinctly different purpose related to engine assembly, making it irrelevant to the task of extending pipe length.