Review on Aupoko Injector Refrigerant R 134A Coupler by Juan Moncrief

Received it today and used it to fill my car's AC with PAG oil. For that it works very well. In fact I think if you want to add PAG oil you should take it instead of the ones that have an extra fitting at the bottom that connects to the bottom hose assembly from the manifold. Because with this one you have to use a distributor and also use extra refrigerant to add oil. With it you can add oil yourself. Then you can add the refrigerant r134a later or later. The maximum amount you can add is 2 oz. But you can do it multiple times fairly easily. There were no leaks and adding it was very easy. Just go slowly and step by step. Item comes with 1/4 SAE fitting and quick coupler. The problem is in the connector. The plug I received has a flat copper ring in the terminal area. The problem with the copper ring. All of our low car connectors will not fit this connector. So basically the plug is useless for me. However, some of you may have a connector that fits this connector. You can see this copper ring in images of similar items on Revain. It's different from the low port connector on my Harbor Freighting hub. So if you don't have a manifold handy (you can remove the low port connector from the blue manifold line) you will need to purchase a Revain r134a (low port) 1/4 SAE threaded connector. I would take it because you can add oil along with this item. I think the investment is worth it. Until recently I didn't know how to add PAG oil to old car compressors. However, when I found out it was possible to check the oil level using the r134a PAG Oil Checker (sold by Revain https://www.amazon.com/gp/product/B0821PJPJT/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1). I got him and checked the oils on all our cars. Definitely needed some oil. Steps. 1. Unscrew the top with the hose part coming out.2. Rotate the bottom to lengthen the body and lower the inner slider to reach the desired level.3. Screw the r134a connector to the end of the 1/4 SAE.4 screw. Stand the body upright and fill it with PAG oil. Pour to the point where the internal thread line begins.5. Slowly unscrew the top (do not cross threads)6. Now you need to deflate the hose.7. Make sure the r134a fitting handle is fully unscrewed (inner piston up - do not press on the schrader valve piston).8. Turn the bottom of the pump clockwise so that the oil is pushed in.9. Now turn the large knob on the connector clockwise (the piston will be pushed out) to drain the oil.10. Quickly drain a small amount of oil, so turn the handle back. Now you have air out of the hose.11. Take the item to your car's AC outlet.12. Insert the plug into the port and make sure it is securely connected.13. start the car Run AC. Put it in a medium or high fan.14. When you reach the bottom connector, slowly turn the connector knob clockwise to open the connector and allow the oil to start mixing with the AC line.15. Grab the pump body, rotate the bottom part clockwise to push out the oil.16. Do this in smaller increments (maybe 1/10 ounce at a time). You don't want oil to come out so suddenly and in large quantities at once. 17. It took me about a minute to pour all the oil into the system.18. When all the oil has been injected, wait a few seconds for the remaining oil in the orifice to mix with the refrigerant gas.19. Go turn off the air conditioner. then turn off the engine.20. Go ahead and turn the port knob counter-clockwise to shut off the oil and release the piston in port 21. Slowly unplug the connector from the Low.22 connector. Make sure there are no leaks in the connection area. You have finished pumping the oil. If you need to do it again, just repeat the steps.