The default tap fitting of the MEP curve type. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Remarks
 This property is used to retrieve the default tap fitting of the MEP curve type, and can be    a null reference (  Nothing  in Visual Basic)  if there is no default value. Use  RoutingPreferenceManager  to set this property for PipeType MEPCurves.