Ummmm... that looks a lot more like a water heater connecting line that the previous owner jerry-rigged. It is, in my ever-so-humble but occasionally correct opinion, very UNSAFE!
I'd do some more research on getting the correct propane-rated line. Your propane distributor is the best place to start.
Seriously, they'll custom-make a hose for you.
"Between what matters and what seems to matter, how should the world we know judge wisely?" - E.C. Bentley, Trent's Last Case