ahuge3@steveodeluxe your right..These traps have a tendency to loosen over time from vibration but if the plumber glued the threads you should be good
steveodeluxe@ahuge3 Shame he didn't or Matt wouldn't have a hole in his ceiling. I would've formed one out of PVC 90s. Clogs would suck but could always be snaked. Anything behind Sheetrock I try to make permanent.