It's also fairly common among instructors, a sizable minority, that reverse the hose mounting on the octopus second stage so that it's easier/faster to donate(IE: they flip it upside down compared to the standard setup, meaning it naturally goes right way up when donating), but it makes it a bit trickier to use your own octopus as a backup, as you're then in the position where you need to flip it for yourself. The hose is still on the right side.