This set of 2 color couplers offer you the great convenience to attach the manifold hoses onto the auto/car AC R134a system during the diagnosis, charging or evacuation working. It can quickly connect the hose without leaking refrigerant,and you don't have to pour the new refrigerant into the air conditioner, which is very safe and convenient. Features: 1. 1/4" male flare fitting for automobile A/C service. 2. Red for high pressure side and blue for low pressure side. 3. High & Low couplers kit with colored knobs for easy identification. 4. Solid brass metal construction is very durable and corrosion proof. 5. Reliable and safe for valve access to systems even at working pressure. Specifications: Material: Solid Brass Metal Color: Red + Blue High Side Coupler: Red Low Side Coupler: Blue Connecter: 1/4" Male Flare Fitting Package Weight: Approx. 140g Quick Joint: Air Conditioning Suitable For: R134a Valve Core Package Included: 1 x blue low side quick coupler 1 x red high side quick coupler Note: Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.