1 Case of Enviro-Safe R134a AC Refrigerant and Dye 12 Cans R134A Refrigerant Replacement with Dye (12 cans) Non-ozone depleting product and is completely safe for the environment. These 6oz. cans are equal to 16oz. of R-134a. Use UP TO 60% LESS! R134 Can Thread For best results, do NOT pull a vacuum on the A/C system.