I have an automotive manifold that I would like to extract the solid volume for export to another analysis package. I've searched the forums and the web for an answer but I am surprised not to find a solution. Maybe I am posing the question incorrectly in my search query.

I cannot post a picture of the manifold in question since it is proprietary but you should get an idea of what the part looks like from this photo. The part I've received (parasolid) is a solid representation of the part and there are no surfaces covering the inlet/outlets. I'd like to extract a solid of the interior void that makes up the internal volume. I know that Simulation requires you to put "lids" on the openings and the software will extract the internal volume for you but I'd like to know how to do it manually. Hopefully, there is a painless method.

I've tried deleting an external surface then right-click>Select Tangency and then use Offset Surface but the surfaces are not tangent and it would be a very tedious process to go and select each surface in order to use the offset surface feature. Is there a way I can cap the inlet/outlets and select or subtract the internal valume? That would be ideal.

Thank you,