The Insert Pipe Text command is used to restore text that was removed using the Remove Pipe Text command.
To insert text on a pipe section, go to
Ribbon: DM Plumbing->Pipes-> 
Insert Pipe Text
Pulldown Menu: DM Plumbing->Pipes->Insert Pipe Text
You will be prompted to identify the pipe section in which text is to be inserted.
Select pipe to insert text on:
The text for the selected pipe section will be restored.