> For the complete documentation index, see [llms.txt](https://help.auxalia.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.auxalia.com/plant-tools/plantspecdriven/how-to-use/configuration/pid-properties/hand-valves-class.md).
# Hand Valves Class
### Size2/Size3/SizeX (mandatory when using Assign Catalog Data or AttributeFlow)
With the exception of Reducers and Relief Valves all other classes have just Size by default. The [AttributeFlow](/plant-tools/plantspecdriven/how-to-use/concepts/attributeflow.md) and [Assign Catalog Data](/plant-tools/plantspecdriven/how-to-use/concepts/assign-catalog-data.md) features can handle multiple Sizes. One for each AttachmentPoint/Port of your Symbol. This means, that even a straight Valve Symbol can have two different sizes. This can be the case if you have a Pressure Reducing Valve. Another example would be a 3-Way Valve where the branch may have a different Size than the AttachmentPoints left and right.
Remark: We limited the documentation to Size2, Size3, and Size4. If you have multi-port valves which require sizes up to 6 you simply add more sizes. The naming is limited to the Format SizeX (where X is an integer from 3 to 6).
### PSD\_Sx\_EndType & PSD\_Sx\_NominalDiameter (mandatory when using AutoPipe)
These properties will contain the EndTypes and NominalDiameters of a selected Part in order for AutoPipe to add the appropriate Flanges/Fasteners. As with the SizeX property you may want to add EndType and NominalDiameter properties for each AttachmentPoint.
