Inheritance Hierarchy:
System.Object
Autodesk.Revit.DB.Element
Autodesk.Revit.DB.MEPSystem
Autodesk.Revit.DB.Plumbing.PipingSystem
System.Object
Autodesk.Revit.DB.Element
Autodesk.Revit.DB.MEPSystem
Autodesk.Revit.DB.Plumbing.PipingSystem