I am a professional automotive technician and have used tools that create a vacuum in the cooling system to eliminate air pockets. and they never worked! So I was a bit skeptical about buying this and let me tell you that this thing impressed me the first time I used it! I love this tool. It's easy and quick to use, lots of different adapters that really fit and the tool is very well made, the sensor is a very nice brass construction. Now I will fill the cooling system.
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