Error Changing Diffuser Family Type (Network Connectivity)

[TasnimTarannum]

I'm fairly new to Revit and I'm running into a bit of a snag. In my current project, I accidentally placed the "Supply Diffuser 24 x 24 Face 12 x 12 Connection" element (which came pre-loaded with the template). However, I actually need the "Rectangular Face Round Neck 24" x 24" Face 12" Neck" diffuser instead.

When I try to select the existing diffuser and change it to the "Rectangular Face Round Neck" type, I get an error message that says: "The family is connected in a network and can no longer keep the connectivity. Disconnect the family from the network?"

[iainsavage]

Usually if you select OK it will disconnect and then automatically reconnect.

Try it and see what happens. You can use Undo if it breaks.

[hmunsell]

it may be related to the Connector settings on the Rectangular Face Round Neck family. it may be set to a specific system or direction that is not allowing it to connect. 

Also, just curious... what is the "Rectangular Face Round Neck" category? is it a Fitting or Air Terminal?

[tawilson]

If you are using flex, Revit probably put a square-to-round on the diffuser. Now you are going to a round neck diffuser and it can't connect. Delete the fitting, swap  out the difuser and reconnect the flex.