73 dart a/c heater hose?

i think that might be how its supposed to be lol. idk why but i think almost all the old mopars i have worked on have been that way. i know my scamp was and is that way and it was truley a old ladys so i doubt it was changed. i used 5/8 hose and tightened it down tight. its long enough and has the rib at the end so it holds good and dose not leak. i really dont know why it is that way tho