When ordering a cross fitting, how is the order of sizes typically arranged?

When ordering a cross fitting, the standard practice is to list the run size first, followed by the largest branch outlet. This convention is used to provide clear and consistent communication regarding the fitting's dimensions and configuration. The run size refers to the main pipe size through which fluid typically flows, and it is usually the most important dimension to specify first to ensure that the fitting will integrate properly into the existing system.

By stating the run size initially, anyone reviewing the order immediately understands the primary dimension that must be accommodated. Following this with the largest branch outlet allows for effective planning of the fitting's placement, ensuring that the larger branch can connect properly to the system as needed. This method of arrangement ensures clarity and minimizes the risk of errors during the ordering and installation process.

Understanding the context is also essential; while the other options suggest various arrangements, they do not conform to the standard industry practice which emphasizes clarity and feasibility in using the fitting within a plumbing or piping system.