The tyre adaptor screws into the bottom of your propellant can regulator to enable you to run your airbrush off a suitably inflated spare tyre. Save on costly propellant cans!
To use a spare tyre for presure, insert the adaptor into the regulator valve and attach to spare tyre.
The tyre must be on a rim and inflated to 40lbs. (2.75 bar) of air pressure