Filter walls by base constraint

Hi, i’m at the beginning of using dynamo.
I want to select all walls of my model, by a value parameter ( base constraint-----> name " ST-0 - Fondazioni". I tried to do as explained in this post
https://forum.dynamobim.com/t/select-elements-by-parameter/6371

but don’t work for me because it seems select all wall of my model

Someone can help me please ?
Many thanks

Thank you for answer. But still not work :disappointed:

again, it show me all walls of my model.
And then, how i can select the elements on list, inside revit environment ?

@filippoperon88 Can you show me the preview of your == node? I suspect there is no True in that list and that is the reason you are getting Empty List on your List.FilterByBoolMask node.

Another question is what you mean exactly when you said: “how i can select the elements on list, inside revit environment ?”

i attached the file

wall_filter.dyn (4.9 KB)

for your question:
i want to filter in revit inside a view, the walls from a value parameter, how i can select it after i run the graph ? ( sorry for my english :flushed:)