Allied Construction Products' Model 500 Ho-Pac features a 12-inch-wide base plate and operates with an impulse force of 3,940 pounds at 2,000 cycles per minute. Oil splash provides maintenance-free lubrication. A four-function valve controls flow, pressure, regeneration and oil-flow direction. The attachment boasts 30 percent more impact energy than the Model 4700 Ho-Pac it replaces, says Allied. Also, new hose routing provides more protection, and three motor options offer greater versatility. The unit attaches to mini-excavators, backhoe-loaders and trenchers with a backhoe attachment.