For use with the Red Angel Multi-Application System (#00223). Red Angel A/C Stop Leak Multi-Application Refill Cartridge is designed for use with the Red Angel Multi-Application System. Red Angel which repairs common leak points in automotive A/C systems . Activated at the leak point only, Red Angel will not crystallize with existing oxygen or moisture in the system. After AC leak repair is achieved, Red Angel will continue to lubricate and condition working parts. Use Red Angel to fix AC leaks, for preventative maintenance, or to warranty hard part replacement against future leak points.