RE: z-bends or quick connects
I use quick connects. They're easy to set up, reliable and did I mention easy to set up. For extra added insurance, I ALWAYS use a drop of loctite on the screw threads and tighten it up nice and snug. I find that when I have to remove the quick connect it's on there so solid that I have to use CA remover to remove it. That's convincing enough for that it's on there nice, tight and secure.
Good luck.