The QS-300 is the gun of choice for power plants. Equipped with state-of-the-art features, this unit holds the edge in tube shooting technology. When the touch-activated trigger is squeezed, air and water propel a Tube Scrubber, Coil Tube Brush or other projectile through a tube 5/8"-1 " (15.9-31.8mm) O.D., effortlessly removing deposits. By far the best - the QS-300 will outshoot any other system! The QS-300 uses compressed air and water to shoot Tube Scrubbers, Coil Tube Brushes, as well as other projectiles through a tube. The operator simply inserts a projectile into a tube and shoots. As the projectile is propelled forward, it forces out deposits, leaving the tube thoroughly cleaned.