Features and Benefits: * Disposable dye cartridge which treats up to 64 vehicle air-conditioning systems * The cartridges are prefilled with solvent-free air-conditoning dye, certified to meet SAE J2297 and calibrated for exact dosing * Also fits all caulking gun and pump type injectors * One easy connection * Universal - compatible with all lubricants and refrigerants BigEZ dye injector makes injecting dye into a pressurized air-conditioning system easier and more accurate. The cartridges are pre-filled, disposable and have one easy connection.