The category id of pipe curves. It will be OST_PipeCurves, OST_FlexPipeCurves, or OST_PlaceHolderPipes.
Namespace: Autodesk.Revit.DB.Plumbing
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2014
Namespace: Autodesk.Revit.DB.Plumbing
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2014
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