Not able to get Option bar parameter in Revit

Hi all,

As seen in the image, I am not able to get the parameter value of “Diameter” for a pipe fitting. It’s working for the pipe.

Try use parameter name : Nominal Diameter

It doesn’t work. There is no parameter named nominal diameter in my model.

The thing is I want to grab the diameter values of both the elements using one parameter name as input.

What version Revit using ?

Revit 2017.2

It not error for me, please send file .rvt in post .

Could not upload the whole file. Here is the pipe fitting family.

Anvil DI 7090 Di-Elec Nipple MPT x MPT.rfa (376 KB)

Use Name Parameter this, it worked.