Hi Pilou, well it's the same function as the Pipe2 command, so see any of the previous images for that plug-in for example here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1463.9

The difference with this new version is just how the pipes are defined, in the original version the controls were for inner and outer radius values. In this new version you instead specify outer diameter and wall thickness. It still generates the same shapes as the Pipe2 script, you can just input the values in a different way.

- Michael