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Adjustable R134A Adapter Fittings Quick Coupler Constructed with accurate snap lock and knurled grip ring; offers easy operation and great performance; detachable copper adapter for easy replacement.Premium quality: aluminum construction for the Blue & Red Switch; nickel plated bronze for the body; bronze construction for the ACME adapter. Features: 1. For R134A service ports quick coupler adapter, 1/4" SAE male flare. 2. Universal Compatibility: The adjustable Adapter Fittings provides universal compatibility for all models. 3. Contain with Low side & High side. Blue: Low side quick connector/adapter; and Red: High side quick connector/adapter. 4. Accuracy and Durability: Accurate snap lock & knurled grip ring for easy operation, detachable adapter for longer maintenance. 5. How to Use: Connect bottoms with vehicle's R134A service port; connect the ACME adapter with the refrigerant hose; turn on/off the switch at top to turn it on/off.