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@busterbw wrote:

When selecting a pipe in Fabrication CADmep 2018, the pipe shows to be 1.5" rather than the proper size. After adjusting the length I have ti select the correct diameter from the drop-down menu or the  selected pipe will be 1.5" diameter.

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I'm not understanding your problem. Most fabrication piping related items are product listed...when you insert them, you need to select the proper pipe size which seems like what you're describing. 

Can you elaborate more on what the issue is?