I don't know how they did it in 2007. Sometimes the tube, where it picks up air in the rear cap, sticks higher into that opening and any water, drains out a small hole below the height of the tube.
I wouldn't worry too much about which they did it, since you haven't had issues.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor