Were you able to fully screw the JG fitting all the way on? I did it the other way around. I fully screwed on the JG fitting first. When I tried seating the RO tubing all the way into the quick connect, I found the nubs got in the way and would not fully seat so I cut them off. Also, I had to liberally apply Plasto-Joint-Stik onto the threads. When I first did the mod, I didn5 put enough on and had some air leakage..
screwed on for me just fine. Have been using it this way for about a month no issue so far.