Reddit reviews PointZero Airbrush Reducer Nipple Fitting 1/4 in. -1/8 in. BSP Male-Male
We found 2 Reddit comments about PointZero Airbrush Reducer Nipple Fitting 1/4 in. -1/8 in. BSP Male-Male. Here are the top ones, ranked by their Reddit score.
Includes 7 exclusive downloadable e-Book airbrushing guides.
This and a mating NPT fitting ought to do it. A water trap is probably a good idea, too.
I used one of these with no issues, don't forget to wrap the threads with Teflon tape to stop any air leaks
http://www.amazon.com/PointZero-Airbrush-Reducer-Fitting-Male-Male/dp/B004KNFP0I