Flexzion AC R134a Quick Connectors System Port Adapters Couplers Low High Set of 2 Conversion Kit for HVAC Auto Car Air conditioning with Manifold Hose Gauge Quick Couplers Red & Blue for Refrigerant R134a to be use in Automobile. Quick Coupling Connections sizes are 1/4" inch SAE Male Fitting The tank adapter is 1/2" ACME female x 1/4" SAE male flare fitting for automobile a/c service This adapter is use for connecting 1/4" SAE hose fitting to R134a automobile refrigeration tank Quick, easy connect and disconnect high flow. High & Low Couplers Kit with colored knobs for easy identification Reliable and safe for valve access to systems even at working pressure. Valve actuation eliminates possibility of refrigerant loss