Review on Wisepick Injector R 134A Quick Coupler by Derek Wagner

Works exceptionally well and makes it easy to add oil to the air conditioner. The only downside is that it takes a bit of guesswork to fill it out. Although it is labeled and graduated on the side, it doesn't lend itself well to filling a jerry can, so I would recommend using a measuring cup or vial to measure the oil first and then pouring it into the jerry can. If you add more than 2 ounces, you will not be able to put the components together and will have to leave something behind and try again. At the same time, it is qualitatively made and I am very satisfied with the device.