These jacks work fast with 100 psi. Any regular size compressor can provide that. However, it works ok with less pressure and the speed is slower, which is not a bad thing. The big problem with these hacks is the lifting height. If you just want to get a wheel off the ground to change it or do brake work, they are great. But, if you need to get under the car, not so good. You still need a regular floor jack to get it high enough.
By P. MCGAFFEY