Master Plumber Practice Exam

The fitting used to connect two horizontal pipes is a coupling. A coupling serves as a direct connector that joins two pieces of pipe end-to-end, creating a straight run that maintains the same alignment and direction. This is particularly useful in plumbing applications where you need to extend a pipe or connect segments of the same diameter without changing the pipe's direction or branching off.

While elbows, tees, and wyes serve important functions in plumbing systems, they are designed for different configurations. An elbow is used to change the direction of a pipe by 90 degrees but does not provide a direct connection for horizontal runs. A tee enables branching off in another direction, connecting three pipes at a junction, while a wye allows for more gradual changes in direction and is typically used when connecting pipes that are not aligned directly. Thus, coupling is distinctly suited for connecting two horizontal pipes directly and directly contributes to maintaining the flow in the same plane.