What type of fitting allows for another pipe to join at a 90-degree angle?

The correct answer is that a tee fitting allows for another pipe to join at a 90-degree angle. A tee fitting has three openings—one for the main line and two that extend outward at a right angle. This design enables the connection of a new pipe that branches off from the main line, making it essential for creating junctions in plumbing and piping systems.

Understanding the role of a tee fitting is crucial in water treatment and distribution systems because it facilitates the redirection of flow and contributes to the overall layout of piping networks. In various systems, including water distribution, having the ability to create 90-degree connections helps in managing flow direction and distributing the flow evenly to multiple outlets.

In contrast, a coupling is used to connect two pipes in a straight line without changing the direction of flow. A reducer serves to connect pipes of different diameters, allowing for a size transition but not altering the angle of the flow. A union connects two pipes in a manner that allows for easy disconnection but also does not involve changing the flow direction.