Factory A/C condensate drain doesn't penetrate firewall in my 71 Demon

[mja1962]

Is there a flexible fitting which connects to the condenser drain on the factory air?

I am adding factory air to my Demon, and am not clear about the condensate drain setup. I noticed that the 3/8" copper tube does not penetrate the firewall, which leads to my question: what should a properly installed drain tube look like? Is there a rubber grommet, or an elbow of some sort? Photos would be appreciated!

Thanks in advance,
Michael Anzalone