Here' a video on this incident, demonstrating the differences between the different tubes and showing what to look for: https://www.youtube.com/watch?v=6DlfLthx

Here' a video on this incident, demonstrating the differences between the different tubes and showing what to look for: https://www.youtube.com/watch?v=6DlfLthx89E https://www.youtube.com/watch?v=6DlfLthx89E