I'm trying to make a automation regarding "couplings" in fabrication objects (in Revit).

Where I need to get all the couplings available in current project, but I could not find any particular property or method that can confirm its a coupling.

After a lot of manual work I found that in all of my local available fabrication databases every duct coupling's CID no is 522 and for pipe coupling its 2522.

Is that something from which I can be sure that particular item is a coupling?