A piping system element. 
   Namespace:   Autodesk.Revit.DB.Plumbing  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB Element
Autodesk.Revit.DB MEPSystem
Autodesk.Revit.DB.Plumbing PipingSystem
 
 Autodesk.Revit.DB Element
Autodesk.Revit.DB MEPSystem
Autodesk.Revit.DB.Plumbing PipingSystem