In a 2x1x2x1 cross fitting, if one run end is 2 inches, what is the other run end?

In a 2x1x2x1 cross fitting, the dimensions refer to the sizes of the openings on the fitting. In this specific case, one run end is 2 inches. The configuration indicates that there are two larger openings (2 inches) and two smaller openings (1 inch). Since the question specifies one run end being 2 inches, it confirms the presence of one of the larger openings.

Given that there are two openings of each size, the other run end that corresponds with the first must be the smaller size, which is 1 inch. This leads to the conclusion that the other run end should indeed be 1 inch.

Understanding the function of the fittings and their respective sizes is crucial in piping systems, as it helps to ensure proper flow, pressure management, and compatibility with connected pipe segments.