You can add caps to the open ends of duct and pipe content.
To add a cap to duct or pipe
To add a cap to a selected duct or pipe connector
To add a cap to a pipe or duct network
Revit uses the information specified in the routing preferences to determine which type of cap to add.
Caps are added to all open ends of the selected element.
Click Modify|Ducts tab or Modify|Pipes tabEdit panel Cap Open Ends.
Caps are added to all open ends of the selected content.
The new caps are highlighted and a warning dialog displays the number of caps that were added. Use the dialog to remove caps or display details about where caps were added.