A tool for use in installing fasteners in workpieces is disclosed. The tool includes a piston cylinder and a piston slidably disposed within the piston cylinder which defines a forward piston chamber and a return piston chamber within the piston cylinder. Pressurized hydraulic fluid is utilized to deploy the piston. An air return chamber is defined in part by the return piston chamber and comprises chambers configured within a handle of the tool. A supply of pressurized air is connected in fluid communication with the air return chamber. A one-way valve is positioned between the pressurized air and the air return chamber.