Sorry, new to CF awareness. Trying to learn anything I can so I can help my friend in any way possible. Ive read posts all over the place on this site on all sorts of subjects, I saw the vest mentioned about 7 times before it was explained, and I still dont know what a chest PT is. All I know is that the vest is a sort of replacement therapy for PTs.Can anyone describe for me what a PT is, and how its done? ---------------Dave21/m/SoCaliCF SympathizerIf you have a good full description of what it is and howto do it, please email it to me at Boredomfiend@yahoo.comsince I might not find my way back to this site