I've been fighting my OBA air lines for sometime. It seems like there's just enough vibration that the hose clamps wear through the hose material and I invariably get leaks. I mean, hose-blows-off-the-barb leaks. I thought maybe crimped connectors would work, but I haven't been able to find a local source for the crimp rings and ends. I'm now looking at AN style connectors (-8 , -6, and -4 sizes) but before I start investing in them, i'd like to see what other folks are using.