> 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/3d-properties/piping-and-equipment-class.md).

# Piping and Equipment Class

It is recommended to make the property Read-Only, because later deleting the GUID value in the property in 3D will unlink the 3D part from the P\&ID symbol. If you want you can also make the property invisible.

![](/files/TqOTxudPi2yBsLisHhsH)