Check whether the type of fitting in this section is main. 
   Namespace:   Autodesk.Revit.DB.Mechanical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2013 
Syntax
| C# | 
|---|
   |  
| Visual Basic | 
|---|
   |  
| Visual C++ | 
|---|
   |  
Parameters
- fittingId
 -  Type:  Autodesk.Revit.DB ElementId  
The element id which can be duct fitting and pipe fitting. 
Return Value
True if the type of fitting in this section is main False if the type of fitting in this section is branchExceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | The ElementId fittingId does not correspond to a valid section fitting member. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |