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Introduction:This set of couplers offer you the best convenience to attach the manifold hoses onto the Auto/Car AC R134a refrigerant system during the diagnosis, charging or evacuation working. Special design is the advantage of this coupler connector, easy to install and use, beautiful and concise style is developed to get incisively and vividly. Manifold hoses can not direct attach to the car AC system (R134a, 14 mm and 16 mm ports). This pair is needed between the car AC service ports and the Manifold set or any service tools to do diagnosis/charging etc!Feature: Material: Brass Metal Construction Red: High Side Quick Connector/Adapter (1/4" SAE Male Flare) Blue: Low Side Quick Connector/Adapter (1/4" SAE Male Flare) Package included: 1x blue low side quick coupler1x red high side quick coupler