This set of high and low pressure couplers from will let you quickly and easily service the R134a AC systems in both foreign and domestic cars, trucks, SUVs, and other vehiclesEASY OPERATION: These 5 and 6-ball quick couplers snap down onto R134 coolant ports, sealing with easy-grip knurled rings and opening valves using their top control knobs; closure and disconnection is just as fast and simpleLEAK-FREE: Built-in O-rings ensure a complete hermetic seal, providing superior protection against wasteful refrigerant leakage; the provided flares give you sure connections to 1/4 inch HVAC hoses or adapters and are detachable for cheap and easy replacement if requiredLONG SERVICE LIFE: Premium threading and materials ensure years of helpful use, with the aluminum and nickel-plated bronze construction offering high resistance to both wear and substances corrosionEASY OPERATION --- Constructed with accurate snap lock and knurled grip ring for easy operation, removable pure copper adapter with oring seals for longer maintenance.