Air Lift Air Lift 1000 Air Spring Kits are inflatable air cylinders made from tough polyurethane material. They fit inside your coil springs and add up to 1,000 lbs. of leveling capacity. Each cylinder has an inflation valve which allows for varying air pressure to level your vehicle and compensate for uneven or heavy loads. Load assists reduce roll, sway, and bottoming out and can be installed on most vehicles with open coil springs. These kits also come complete with air lines, fittings, brackets, and mounting hardware.