Features and Benefits: * Disposable cartridges come pre-filled * Compatible with all A/C systems * (6) .5 oz cartridges * Great for diagnostics, too. Nothing is easier! Service multiple systems with just one connection per system EZ-Ject cartridges provide the fastest, easiest and cleanest way to add Fluoro-Lite dye to multiple air-conditioning and radiator systems, with only one connection per system. The best method for preventive and programmed maintenance.