A: The male quick couplers in this kit are standardized for air (i.e. pneumatic) tools. The male threaded end of the couplers is sized and threaded for 1/4" female threaded fittings, so these should be ready to use w/ most pneumatic tools you have (i.e. nailer, impact wrench, handheld chisel, etc.). Also, most air hoses use a 1/4" male quick coupler, like the ones in this kit, on the end of the hose connecting to the compressor. If you have a hose that needs a 3/8" male quick coupler, this kit won't work for you. Often large compressors have a 3/8" outlet for the air coming from the compressor. So, if you are looking for a female quick coupler for something like that, you'll need to get a 3/8" to 1/4" coupler to use w/ the female quick coupler from this kit. Hope these details help.
A: yes it will fit
A: yes you can
A: If your airbrush has a 1/4" female fitting, then yes. Most tools have a 1/4" threaded female fitting. But, if the diameter of your airbrush is anything other than 1/4", then you'll need to look for a quick coupler of the appropriate diameter.