Description: Quick Coupling with Adapter. Quick Coupling Connections sizes are 1/2" inch SAE Male Fitting? The tank adapter is 3/4" ACME female x 1/2" SAE male flare fitting for automobile a/c service. This adapter is use for connecting 1/2" SAE hose fitting to R134a automobile refrigeration tank. Quick, easy connect and disconnect high flow. Reliable and safe for valve access to systems even at working pressure. Specification: Blue: Low side quick connector/adapter (1/2" male flare straight) Red: High side quick connector/adapter (1/2" male flare straight) Height: Approx. 5cm/1.97inch Thread outer diameter:Approx. 1.1cm/0.5inch Package Includes: 1x blue low side quick coupler 1x red high side quick coupler Note: Please allow 1-3mm error due to manual measurement. And make sure you do not mind before you bid. The colors may have different as the difference display,pls understand