This TQ Pro "Latest Applied Technologies" 30,000kg Air/Hydraulic Bottle Jack is constructed of superior grade steel and built to premium standards for quality and durability. The premium-quality, large diameter hydraulic steel cylinder unit results in lower oil pressure needed to raise the load. A built-in bypass device protects the hydraulic system from over-pumping damage. The sturdy and stable design features a welded base and cylinder to assure strength and eliminate leaks.