If the corner of the two green lines is exposed to the attic, put a T there and extend to 6-12 inches above the level of the evaporator condensate pan. Makes it easier to clean the vertical line and gives you an eye to see you have cleaned out the horizontal run. Also serves as a siphon break for the vertical. Just make sure the extension is well above the top of the pan so it cannot overflow if the vertical gets plugged.