tube

Hi, would anyone know what the black tube hanging from the rear driver side of my car is (Volvo XC40 Petrol 2018). Opposite side to exhaust but same side as fuel cap. I can’t see where the loose end would have connected to. The third picture which shows the other end is still clipped in place...

I have a T8 ballast to replace in my strip light. I took it down hoping to replace it with exactly the same part. However I don’t seem to be able to locate the particular one that’s in there. I’m not sure which spec I have to be careful to match to ensure it’s the best alternative and make...