Features and Benefits * Six-ball coupler provide a more stable grip on the fitting * Allows access to service ports on automotive R-134a A/C systems * Compact design makes it easy to fit into tight quarters, which is especially handy for retrofits * Quick-Connect design has an integral safety sleeve * Color coded Red, high side 90 degree coupler This coupler is for Automotive R-134a, its a field service coupler that is used to connect our special Enviro-Guard™ hose. Which allows access to service ports on automotive R-134a A/C systems. Its designed with the quick connect, which has an integral safety sleeve that protects against injury and loss of refrigerant if the coupler is disconnected under pressure.