Hi Matthias,

You can create your own parts from scratch using the MAKEPAT command.  You will be asked for a part number to load the correct template 2522 for a coupling.  You can find a full list of part numbers here:

https://knowledge.autodesk.com/support/fabrication-products/learn-explore/caas/CloudHelp/cloudhelp/2...

The parts are fully customisation and you will then be able to add it to your service, adding them as a coupling on your pipe.

Regards