Yes, a 6-gallon sized air compressor operates an impact wrench. However, it is not recommended that you work only for a few minutes, and then the stored air is exhausted out. A 6-gallon sized air compressor is the smallest size that can operate a wrench. Other applications are to powering HVAC pneumatic control systems and tools, pump to fill high-pressure air and gas cylinders, and divers supply. For domestic purposes, it is used for tire inflation.