Leave faucets open?

Well, I got all the water systems flushed and drained today. I'm very glad I have you guys because nobody at the dealer ever told me to do this. I wasn't able to find the leak in the line when I had it under city pressure, but I'll keep an eye on it. Here's a pic of my hot water line heading up to the vanity. I've never seen connections / clamps like these so I don't know what I'm dealing with if they do leak. I'd appreciate if someone could put a name to what they are so I can research them. Like I said previously, I would have assumed that one piece of tubing from the floor would be better than 3, but there they are.