Certified A/C Pro Super Seal is used to repair metal leaks and seal rubber leaks in car A/C systems. Included in this kit are a 3oz can with 1. 5oz of R-134a and 1. 5oz of additives and a dispensing hose. Immediately after using Certified A/C Pro Super Seal it is necessary to add additional R-134a to the vehicle's A/C system (sold separately).