Abstract: An air compressor system includes: two or more compressed air tanks previously filled with compressed air; several compression chambers also filled with compressed air, each containing a small internal expandable tube; located inside a larger external heavy-walled tube bonded to endcaps containing one-way and two-way valves, rigidly attached to top and bottom outside tanks; a timed valve inside expandable tube allowing compressed air from top tank to expand that tube to inside of heavy-walled tube, compressing ambient air outside expandable tube that entered through one-way valves. A second timed valve opens, forcing the original air back into the tank bottom or for immediate use or storage. Several other compression chambers follow the same procedure nonstop, increasing the psi in tank for immediate use or storage. All FIG. 1A compression chambers share two common tanks, which fill from top tank 600 and empty in bottom tank 602 in sequence.