Wisepick AC Oil and Dye Injector Kit, Suitable for R134A R1234YF Refrigerant System, with Adjustable Coupler Checkers

Capacity: 1/4 oz/7.5ml---2oz/60ml. Professional AC Oil and Dye Injector Kit for injecting oil and dye through low pressure suction side into the air conditioner compressor. Includes 2 pieces low side oil checker. With extra couplers for connecting with automotive 134a and 1234yf blue port, hose fitting feature 1/4 inch female 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. Guarantee, 1 year return, refund or free exchange if you aren't completely satisfied.