Fitting for filling an FX Bottle directly from compressor or handpump?

I don't think you can fill that 480cc bottle with out being on the airgun but you can see if the make a adapter to do it I would get one to because I have to switch bottles every time I fill my inpact I looked before and could not find anything to do it but I guess will find out soon. John

great idea. some one needs to come out with this