To add sizes to the pipe connectors on parts, enter the nominal diameter of the connector. This causes the software to retrieve an appropriate physical diameter based on the connection type.
To retrieve the physical diameter, the software searches the active pipe catalog for connectors with the same connection type and nominal diameter. If the part to which you are adding sizes is a fitting, it then filters the results to include only the connectors in the catalog with the same part subtype, if specified. Then, it retrieves the physical diameter for the nominal diameter for the first connector in the results, and inserts the value into your part.
If necessary, you can modify the physical diameter values retrieved by the software.