nfgo3 – Please verify your info before you post.
“enables fluid to drain into the eustacian tube”.
The ventilation tubes cause air to come in and fluid to go out!
Anatomy Lesson -“eustacian tube” -is between the middle ear and pharynx (throat). Its main purpose is to drain the ear (there are other purposes also). If it gets clogged, you can have problems. Also, bacteria can travel up the tube to the ear.