
Anyone complaining that they don't understand this thing has never put a 4 piece puzzle together, has no critical thinking skills and shouldn't try. This is the easiest vacuum coolant filler I've ever used. Doesn't take much air from the store and is VERY easy to use. Comes with adapters to fit most vehicles. Many cars today require vacuum filling to properly remove coolant. This is a very affordable tool that works very well. I take off from these Chinese instruments, but this one is really high quality.

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