Good day. As to my comprehension to the matter, your victaulic coupling automatically placed on your fittings to pipe and fittings to fittings right? But if pipe to pipe, it doesn't automatically placed. Two things, open the Spec viewer if the Victaulics are placeable or just acts as a fastener, if it acts like a fastener therefore you must do something in the setup or in your catalog and Spec. If the victaulic clamp/coupling can be placed manually therefore that solves your problem, but as to your case, you said you cant locate the victaulic component in your pallet. I do not use pallet but then its just the same as the Spec viewer.
To solve your problem as a work around.
1. Fastener Clamps (victaulic) in the default connection settings requires (Groove to groove or Groove to Plain End, GRV - GRV or GRV - PL).
2. If you are the one who created your catalog and specs, you can create a new pipe that has GRV ends, or at least one end GRV so it could connect to your stub and other same connection.
3. Or you can customize a Victaulic Clamp/Coupling that you will manually place and control to your model.
4. Editting the connection settings is not ideal, but then can be done with caution.
Best Regards,
Pat Andres
Autodesk Expert Elite
Plant 3D Administrator
GHD Manila