There are so many out there a red one would be nice or a green hose. Im not sure which one to get I dont see the size of the coupling anyplace even on Iwata's site.
As long as it has one end the same as the airbrush ( 1/8 bsp ) and the other end is the correct size for your compressor ( could be 1/8 bsp same as the airbrush, or the bigger size 1/4 bsp ) you will be fine.
As long as it has one end the same as the airbrush ( 1/8 bsp ) and the other end is the correct size for your compressor ( could be 1/8 bsp same as the airbrush, or the bigger size 1/4 bsp ) you will be fine.