How is the size of a reducing elbow typically specified?

The size of a reducing elbow is specified by the largest size of the two ends because this convention allows for consistency in installation and fitting. In plumbing and piping systems, fittings need to connect to pipes of varying sizes, and specifying the size in this manner ensures that the fitting matches the pipe size that requires the larger opening.

When discussing a reducing elbow, which serves to change the direction of flow while accommodating two different pipe sizes, it is essential to identify the larger diameter. This practice simplifies the selection process for installers, as they can quickly determine the compatibility of the fitting with existing piping.

Specifying the size by internal or external diameter would introduce variability since the dimensions can vary based on wall thickness or material. Moreover, indicating size by a weight doesn’t provide sufficient information about the fitting’s application or compatibility with existing pipe systems. Therefore, using the largest size of the two ends is the most practical and widely accepted method in the industry.