Carl Rushing

i have a 2013 Yukon, and the drain appears to be similar to what NEWDUDE shows in his June 12, 2023, post. My vehicle is draining back into the passenger side (picture taken two weeks ago attached). I looked again yesterday, and the black collar in the picture is gone. Over time, it must have become brittle and broken off. I can feel moisture if I put my pinky in the drain hole location, where the water does not make it past the firewall. Does anyone know the procedure to replace the drain? As anyone knows, this is hard to access. All the YouTube videos I found so far are worthless. I need to figure out if there is some tubing left on the AC Condenser drain outlet and remove it. Trying to figure out how to install a new drain tube. Plus Rock Auto is a little sketchy on the part and shows TWO different options.