To create an iso message

1. On the ribbon, click Isos tabIso Annotations panelIso Message.
2. In the Create Iso Message dialog box, Enclose Message In drop-down list, click the message enclosure.
3. Enter the desired message text in the Message box.
4. To create a locating dimension for the message, select the Draw Dimension to Message check box.
5. Click OK.
6. In the drawing area, specify an insertion point on the center line of pipe or a fitting.

   A marker is added inside the pipe. You can see it if you switch to wireframe view.