A lot of rapids rides use a replaceable bladder system made by the company CPI. This is their replacement bladder video to show how this process is done.
if you work on a rapids ride its important to note that the collar featured seams easy to replace because no tub is installed. on the ride its fair to say the process is much more difficult. Never run a bladder over 2 psi.
my experience shows its best to deflate all bladders during this process.
no this video is not sponsored by CPI

CPI web sight https://www.cpitx.com
Phone number +1 (512) 295-2683