Rich, I battled with it for a half hour with some very rigid 5/8" transmission line that I bought to make a tight 180 bend. The hose won the battle! I ordered some other stuff to use instead.I will say, getting the line in that copper U bend was a pain.
Here is the hose that I used/researched that seems to be a good option. Was in stock at local NAPA store.I will say, getting the line in that copper U bend was a pain.