^ Yea I think the 02 is different. I know there's a third tube somewhere, but as you said 2H, I've always only noticed two tubes under the fairing in that little notch. I know there's a third, but it doesn't go all the way down with those other two. It's hanging somewhere else. I'm away from my bike right now but I'll check it when I can. But Aken's right about those three tubes. Fuel vent, fuel overflow, and coolant.

 

The third one isn't really hanging. It's attached to the metal canister on the bottom. I guess it's a vaporizer or something.