That red one for $39 is the same one they use to get to the diverter valve clamps on the TT. For some reason, Porsche always clocks the clamp nubs on the backside of the hose away from you, and there's no space to get your hands in there....and this is one of the few tools that can get behind there to open the clamp. Not something you use a lot....I used it once....but sometimes it's that special tool that makes the difference between a 10 minute job and one that takes 4 hours....or a bunch of colorful adjectives followed by a drive to the indy shop.
I think all of the clamps rotate if you push on the right side and the right dirrection... but I had my hour (plus) fight with one followed by replacing with a screw type clamp... the red one looks like a winner!!