You twist the plastic knob on top of the moisture trap to adjust the air up and down. Honestly it could be a lot of things causing your problem, but without knowing specifics id say it has something to do with quality. that is a very poor quality airbrush and its a siphon feed, any little vacuum leak in your brush will affect paint flow. Plus the little preset screws on those suck, they keep the needle open and if it sits for even a short period of time you can get some clogs from the paint drying in the nozzle.
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