Disposable dye cartridge which treats up to 64 vehicle air-conditioning systems . The cartridges are prefilled with solvent-free air-conditioning 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.