If MEP Modeler is installed, then many familiar elements from the ARCHICAD Library, such as this Basin, will now include MEP Custom Settings (including the Connection tab page), so you can connect them to any object in an MEP route:
If you are working on ARCHICAD without MEP Modeler installed, the same objects are, of course, still available from the Library, but their custom MEP parameters are not available.
It is likely that an ARCHICAD project file will be shared or transferred among team members, some of whom have installed MEP Modeler, and others who have not. In such cases, you should note the following behavior of objects having MEP-compatible parameters.
Note: In the following workflow descriptions, “ARCHICAD Environment” means that ARCHICAD is installed without the MEP Modeler Add-On. “MEP Modeler Environment” means that ARCHICAD is installed with the MEP Modeler Add-On.