High and Low Couplers Kit with colored knobs for easy identification. Red for high pressure side and blue for low pressure side. Convenient to attach the manifold hoses quickly and easily onto the Auto/Car system during the diagnosis, charging or evacuation working. Features - Color: As shown. - Size: About 4.4X2.5X4 cm. - Material: Brass. - Made of high grade material, durable in use. - High & Low Couplers with Colored Knobs for Easy Identification - Used for connecting 1/4" SAE hose fitting to automobile refrigeration tank - Reliable and safe for access to systems even at working pressure - Durable, unique and user-friendly design. - Small size and light weight, easy for carry. - A perfect accessory for car air conditioning. - Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Specification: Red: High Pressure Side Quick Connector/Adapter (1/4" SAE Male Flare 90 Degree) Blue: Low Pressure Side Quick Connector/Adapter (1/4" SAE Male Flare 90 Degree) Connecter: 1/4" SAE Male Flare Fitting Package list: 1x High Pressure A/C Quick Coupler R-134a (Red) 1x Low Pressure A/C Quick Coupler R-134a (Blue)