What is the end to center measurement of a reducing 90-degree long radius elbow?

The end to center measurement of a reducing 90-degree long radius elbow is based on standard specifications for pipe fittings. In this case, for a reducing elbow, the measurement refers to the distance from the end of the fitting to the center point of the radius, which is essential for determining how the fitting will fit within a piping system.

A 90-degree long radius elbow is designed with a specific radius that generally maintains a smooth flow of fluid while minimizing turbulence. The "long radius" part means that the radius is longer than a standard elbow, which helps in achieving these flow characteristics.

In the context of the choices provided, B, which is 1-1/2 inches, is consistent with the standardized measurements for reducing long radius elbows in plumbing and pipe fitting codes. This allows for easier installation and better compatibility with varying pipe sizes. The other measurements listed do not correspond with standard practices for the dimensions of reducing 90-degree long radius elbows, making them unsuitable within typical applications.

Understanding these measurements is crucial for ensuring proper fit and function in pipe fitting tasks, as they directly impact the layout and design of plumbing systems.