Specifies the nominal diameter and unit associated with the pipe.
NPD
Specifies the nominal piping diameter for the object. Select a value from the list, or type a value in the text box. If you type an unsupported or invalid value, the box displays a red border and the corresponding error message, listed below.
Current port configuration does not return valid Nominal Size values.
NPD Unit Type
Specifies the units for the NPD value. Select mm or in from the list.