I would recommend just starting with our endcap, and just modify the visibility of the graphics in plan.
Alternatively, consider the use of the application, and what the pipe break implies. If your pipe is really a continuous pipe,and you're just breaking it for graphical representation, well.. things such as flow through the pipe may no longer work as expected.
However, if you are using the 'break' at, say, the 'domestic water' entrance, this makes perfect sense.
Cheers-
MS
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.