I suspect that a lot of people will tell you that these things are crap, and that it won't work. However, I've used mine sucessfully on several occasions. It can pull to the limits of my gauge (more than 28") in my applications. The caveats: I do my A/C work at garage where I have access to shop air (some ungodly cfm at 90 psi) and I'm at sea level. If you have a small oil free compressor, its not gonna cut it.

__________________
Tjohn

82 300 SD
77 450 SL (gone)