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.
Order from Allseasons, we can provide 12 months free worry warranty, If any question, please feel free to contact us, our customer service will reply you within 24 hours（Instructions have not been updated in the box, please refer to the webpage description）
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