on the valve from the air conditioning system in the car, there is a blue and red quick coupler for filling the r134a refrigerant.

valve air conditioning system car there blue red quick coupler filling r134a refrigerant plug charging refrigeration station liquefied gas hose pressure recharge 134a cooling rubber engine compartment connection pipe coolant compressor maintenance motor liquid compressed refilling workshop condition tube service machine cool repair equipment conditioner auto refill pump automobile