Yeah i just mean as here, then you cant set thesystem type…and if try get the parameter it will gve a string “undefined” and not a element.type
but if you have undefined just filter them out or set a type with connecct a pipe with systemtype, as we have to do manuel in revit as well…if that the case you can take a look here…Apply MEP System to a "Undefined" System Type Network - #2 by sovitek