Industrial Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Study Guide

Using a reducing coupling is the appropriate choice for connecting a 1" pipe to a 1 ½" valve because this type of fitting specifically accommodates different diameters, allowing for a secure and effective connection between pipes of varying sizes. A reducing coupling has specific end sizes that taper from one diameter to another, which makes it ideal for this scenario.

In the context of plumbing and piping systems, proper fitting selection is crucial for ensuring fluid flow and system integrity. A reducing coupling will maintain a tight seal between the two pipes, preventing leaks and ensuring that the system operates efficiently.

Other fittings may not provide the same level of compatibility for diameter differences. For instance, a coupling is designed to connect two pipes of the same size, while an elbow fitting is suited for changing the direction of pipes rather than adapting to different sizes. Additionally, while a PVC fitting could potentially serve various purposes depending on its design, it does not specifically address the need for a size transition between a 1" pipe and a 1 ½" valve. Thus, in this case, the reducing coupling is the most logical and effective choice.