Atoplee Car Ac R134a Quick Coupler Adapter Automotive High Low Pressure Adapter, 1/4 inch SAE Material:Brass, Plastic, Compact construction for a long lasting and rust proof life Model:R-134A,This coupler offers you the best convenience to attach the manifold hoses onto the Auto/Car AC R134a system Color:Blue, Magenta, Gold Tone, Red for high pressure side and blue for low pressure side Threaded connection: 1/4SAE, fast and easy service hose connections without leaking refrigerant Widely used , normally for manifold guage automative tool