Represents wall design thickness of rectangle. 
   Namespace:   Autodesk.Revit.DB.Structure.StructuralSections  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
Remarks
 Design thickness of pipe wall is value should be thinner value than measured real value (nominal).