Interdynamics EZ Chill Recharge & Retrofit Kit (Three 12 ounce cans) All-in-one solution  no additional tools required, 36 oz. total fill (three 12 oz. cans) to replace lost refrigerant. Easy to use kit, includes everything needed to recharge an automotive A/C system or retrofit from R-12 to R-134a Includes three cans of High Mileage R-134a with Oil and How-To CD Comes with reusable trigger dispenser with built-in gauge and temperature dial indicator Includes retrofit valves needed to convert the high and low-pressure ports from R-12 to R-134a and EPA-approved label Includes everything needed to recharge an automotive air conditioning system or retrofit from R-12 to R-134A Comes with reusable trigger dispenser Built in gauge and temperature dial indicator Squeeze trigger to add refrigerant let it go to measure the system pressure