What is the name of a short piece of pipe with a hub on one end and a straight cut or 45 degree cut on the other used to tap into a sewer main?

The correct term for a short piece of pipe with a hub on one end and a cut on the other that is utilized to connect to a sewer main is known as a thimple. This component is specifically designed to facilitate the tapping of other pipes into a sewer system, making it effective for connecting different sections of plumbing.

The design features a hub that allows for a secure fitting, while the angled cut on the other end enables the pipe to be joined at an appropriate angle, which is often necessary for the efficient flow of wastewater. This detail is essential for effective drainage and ensuring that sewage moves smoothly through the sewer system without creating blockages or backflow issues.

While other options, such as elbows, unions, and couplings are also vital in plumbing and piping systems, they serve different purposes. An elbow is used to change the direction of piping, a union allows for a removable connection between pipes, and a coupling is generally used to join two straight sections of pipe. Each of these components plays an important role in maintaining the integrity and functionality of a plumbing system, but they do not directly represent the specific function of tapping into a sewer main as a thimple does.