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    ADJUSTABLE AC R134A COUPLER: Adjustable function allows you to open and close easily by twisting the red/blue knob on the quick coupler adapters, rather than take them off from the service ports. Adjustable pin in the quick coupler reduces the wear for the Schrader valve in AC service port, and ensure there is no leakage of refrigerant when connect and disconnect the port.
    HVAC QUICK CONNECTOR: Premium brass and aluminum is featured with high hardness, wear resistance, anti-corrosion. Work with rubber sealing ring, ensures the gas tightness with no leak. At the bottom of the automotive air conditioner coupler, quick interface and ball bearings designs are compatible with all models with standard R134A service port. And the accurate snap lock and knurled grip ring help to connect and disconnect easily and quickly.
    EASY TO CONNECT: Connect the blue coupler to AC suction service port and the red one to AC discharge service port. Use the 1/4″ male flare adapter to match the 1/4″ female fittings from AC manifold gauge hose, red to red, blue to blue. Ideal fittings for AC evacuation (vacuum), diagnostic check, coolant charging and recovery work.
    ATTENTION FOR OPEN CLOSE DIRECTION: Clockwise for open and anticlockwise for close. Clockwise turn the knobs, the internal pin is lowered down and open the Schrader valve in service port, connect the two systems. On the contrary, anticlockwise to disconnect the two systems for close. Please refer to the label on the knobs while using.
    SATISFACTORY CUSTOMER SERVICE: 30 days full refund with returned undamaged JIFETOR adjustable AC R134A quick coupler. Any quality related problem in 1 year, we will replace the fittings for free or refund. Any question, please feel free to contact us by email or amazon message system, we will reply ASAP in 24 hours.