Recently my o ring seal that seals the nozzle head to the body of the airbrush went bad. Air was feeding back into the cup.
Going online, I found several sources for a factory replacement but the lowest price I could find was $10 plus $4 shipping for a single o ring. I felt this was excessive.
The part number for the o ring is I-580-2 and is the same o ring for all models of micron airbrushes. It also works for Olympos Micron 200. I went to my local Ace Hardware and found an o ring that worked. It ran .60 cents so I bought 4.
Came home, installed the new o ring and the airbrush is up and running again. Save a few bucks when this o ring goes bad and you can get several o rings for a fraction of what one costs from Iwata.