Enviro-Safe R134a AC Refrigerant + Dye 3 Cans R134A Refrigerant Replacement with Dye (3 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.