Checks if given type is valid piping system type. 
   Namespace:   Autodesk.Revit.DB.Plumbing  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Parameters
- document
 -  Type:  Autodesk.Revit.DB Document  
The document. 
- systemTypeId
 -  Type:  Autodesk.Revit.DB ElementId  
ElementId of the piping system type to check. 
Return Value
True if the given systemTypeId is the piping system type, false otherwise.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |