Plumbing help - New drain leaks from slip nut connecting brass to PVC - help
I followed all the instructions, watched all the videos, but my lack of plumbing skills are apparent. I installed a new drain assembly in my kitchen sink. When I tested it I was so happy no leaks! Until I filled the basin, removed the stopper and water came from the slip nut area. The leak is in the location circled in the picture. Only happens when the tub is full and runs out.
Do I need a new slip nut? A washer (note there is no washer in the slip nut, never was)? Do you see anything wrong with my install? If you think I need new parts could you name them for me so I can get the right thing from the store (size too).
Thanks in advance for your guidance everyone.