The inline filter is indispensable, if you want to get professional results with little or no hassle. I truly appreciate being able to paint a project without having to be concerned about having moisture muck it up and being frustrated with the results. I purchased this filter to go with an Iwata airbrush given to me as an anniversary present. Love it.
I highly recommend to anyone to grab one for their airbrush. You will not be disappointed with the results.