This can tap is designed to fit R12, R22, cans of Refrigerant, Oil Charge, Freeze & Stop Leak. The tap clamps on to the top brim of the can, while piercing the center. The part of the can tap that connects to your car is for R12 & R22 threads only. Although rare, can taps can break causing loss refrigerant from the can. We are not responsible for the loss of refrigerant with this can tap set but will replace the broken tap if within the warranty period.