This document summarizes a pneumatic circuit upgrade project for a 3-level lift. It discusses the original 2-level lift configuration, the benefits of upgrading it to 3 levels such as improved safety and work capacity. It also lists the key pneumatic components needed for the upgrade including cylinders, valves, buttons, and gates. A positional sketch of the upgraded circuit is provided. The conclusion restates that the upgrade prioritizes safety and hopes the new design is well-received by users.