1/4 oz/7.5ml---2oz/60ml. With two adapter; A R134a Quick Coupler and Low R1234yf Quick Coupler Oil cylinder can filled with 0-2 ounces of refrigeration oil, check valve screwed onto cartridge and tightened. The inner and outer cylinders are tightened clockwise, and then a little 1/4 SAE threaded inner core is used to discharge a little air inside the blue tube. Connect the low-pressure port of the refrigeration system that needs to be refueled, and add the required amount of cooling oil to the inner and outer cylinders. Use injector to add 2 oz. of oil to a R-134a and R1234yf air conditioning system under pressure or during service. We provide 100% perfect customer service, please contact if there is ANY problem
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