Introducing Mixer Systems 4* and 6** cubic yard output Twin Shaft Mixer. Our Twin Shaft Mixer is designed with off-the-shelf components for ease of service and maintenance, featuring air purge shaft seals, a single drive motor, heavy duty cast steel mixing arms and a hydraulic discharge door. The high volume, high shear mixing action gives you mixing times from 60 to 90 seconds. The Twin Shaft mixer is designed and manufactured in America, at our facility in Pewaukee, Wisconsin.