Duct/Pipe System Property

Hi,
I’m trying to change properties of Duct/Pipe system with Dynamo. What am I doing wrong in this script

Fun fact, often times when the parameter uses a drop down menu, it isn’t set using names as the value but integers. For this case, 0 is None, -1 is All, etc.
ductsystem

So when you try to set it, use an integer. For None, try setting it to 0.

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Thank you