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: Height: Approx. 7cm/2.75inch Large Thread outer diameter:Approx.1.7cm/0.67inch Large Thread inner diameter:Approx.1.2cm/0.47inch Small Thread outer diameter:Approx.:Approx. 1.1cm/0.5inch Package Includes: 1 Piece Quick Connector Note: Please allow 1cm 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