I was really impressed with this unit. I saw similar products on YouTube. I needed to replace a leaking valve core on the high pressure side of my air conditioner on my old Toyota Camry that uses R-12 refrigerant. When I opened the package I saw that it was a quality product. It's very well done. It was very easy to use even though it was my first time doing such a task. I've called every local auto parts store in the area and they haven't even heard of a tool that allows you to change the valve core without draining the system! If someone tries to tell you that this is not possible, they are simply wrong. Anyone can do it. It's easy. Be sure to order replacement valve cores when ordering this part. I ordered Robinair valve cores #40352. They also looked great and fit. I have no idea if the valve cores will hold up as I just installed them today.
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