My Guess: To provide air outtake to relieve the pressure that builds up inside.
Sensi Super Skunk Reviewed by Sensi Super Skunk on . whats this part for in an aeroponic system? (pic) i see this part in many aeroponic systems, i dont know whats its use and how to use it. I really dont think its neccessary but i dont want to take any chances when i build my own. thanks. The first pic just shows an aero system, the second shows the part i want to know about. Rating: 5