Best IFC classification for a reducing coupling

Users IFC
1

The IfcPipeFittingTypeEnum gives us the value CONNECTOR to classify a coupling used to join two pipe segments. However, if I have a reducing coupling made of the same material (PVC), should it still be classified as a CONNECTOR, or may I classify it as a TRANSITION, since it is a fitting with two ports of different sizes? Which is the best classification?

2

I think TRANSITION makes more sense if the nominal diameter changes. I would think of COUPLING as an element with the same nominal diameter on all sides.

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3

MagiCAD uses TRANSITION in such cases both in ventilation and piping side.

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4

Thanks @ejs and @marko.ripatti.