I know exactly what hose I need, but I can’t find it anywhere. It’s a hose with 1/4" fittings on each end, the kind that the brush screws into. I have a Master G23 airbrush and a Testors mini compressor. Anybody have a link?
Your statements are contradictory. You cannot connect a Testors Mini Blue compressor to a Master G23 airbrush using a hose with 1/4" fittings on both ends.
The compressor has 1/4" BSP thread, but the Master G23 uses 1/8" thread. If you really have these two pieces of equipments, any industrial standard Iwata type airhose should work for you. You can get an Iwata brand airhose for $12 at Hobby Lobby or a generic brand one for $7 at a Harbor Freight store. The picture below is the HF one.
Is there any reason that you’re starting a second thread instead of just continuing your previous one?