Air gap intake and heater hoses

Ive already posted the picture of that twice here; do I need to post it a third time?
in the pic, there is not a 1/2" pipe fitting in the 1/4" hole,
Ive already posted the picture of that twice here; do I need to post it a third time?
look at ur own pic, there is a 1/4" temp sender in the 1/4" hole !