In the case that your geometry has a connection point for ...
... which has to be transferred to Revit, please proceed as described in the following and publish the eCATALOGsolutions Connection point as one of the above mentioned points.
Open the 3db file and set the required connection point which can freely be named.
Select the tabbed page Classification and there the subpage 3D view.
Via context menu of the 3D view, open the dialog Choose connection point.
Under classification Revit, activate the class Duct connector.
Under Connector Description, enter a description.
Connection points in eCATALOGsolutions can be created anywhere. Functional connectors (suitable for Revit) have to be created at the center of a plane surface (centroid), e.g. The center of a circle or the intersection of all angular diagonals (see https://en.wikipedia.org/wiki/Centroid).
It is recommended to create an extrusion at the position where the connector should be placed. (>1.4 mm diameter / extrusion length).
If it is not possible to have a plane surface in the 3db available, the CADENAS Revit interface will attempt to create a “dummy solid” (2x2x2 millimeter) at the position where the connector should be created. This should not be the preferred way to design a model, as the end result in Revit will not be 100% identical with the eCATALOG model.

![[Note]](https://webapi.partcommunity.com/service/help/latest/pages/fr/installation_ecatalogsolutions/doc/images/note.png)

![[Tip]](https://webapi.partcommunity.com/service/help/latest/pages/fr/installation_ecatalogsolutions/doc/images/tip.png)