Dyanmo not reading type mark

Revit
1

I am creating a graph that reads the mechanical equipment in my model. Each piece of equipment has their type mark filled out (3 are VAV and 3 are AHU.) When I try to run the dynamo script it doesn’t read the type mark any idea why?

Dynamo Equipment
Dynamo Equipment1226×680 184 KB

2

You should place a elment.Element node before the “type mark” get parameter value by name node, that way you can access to the type parameters of the element

3

Thank you!
Why does adding an Element.ElementType node before returns the expected result?