The Find Pipe command is used to locate a pipe selected in an isometric on the plan view, and vice-versa.
To locate a pipe shown on either an isometric or plan view, go to
Ribbon: DM Plumbing->Pipes-> 
Find Pipe
Pulldown Menu: DM Plumbing->Pipes->Find Pipe
You will be prompted to identify on either the isometric or plan view the pipe to be located.
Select pipe to find:
The pipe will be highlighted in the other view. A line will be displayed between the cursor and the pipe to help you locate it.
Press ENTER to finish the command. The highlight and displayed line will be removed.