@@crackerattacker3781 it looked like it by build but the only 4 valve top-action valved tuba they have is the YBB-321 which couldn't have been that one
I hope this was intended as a joke, not as an actual 'how to' video. This is NOT good or effective way to clean a tuba, and certainly does not properly or effectively clean the valves or insides of tubing. Most teenage/high school players have no idea of how to clean their instruments.....