Interdynamics 320 R-12 to R-134a Retrofit Kit Retrofit kit to convert all R-12 vehicles to R-134a Comes with conversion oil with additives to prolong life of compressor and stop leaks Includes reusable recharge hose Contains retrofit valves needed to convert both high- and low-pressure ports from R-12 to R-134a and EPA-approved label Requires additional refrigerant