The F4 Slope hydrovac from Tornado Hydrovacs holds 13 cubic yards of mud and more than 2,100 gallons of freshwater. It has a water tank from which to excavate, a mud tank where excavated spoils are held, a water pump, a boiler to heat the water, and a 3,600 to 6,300 cfm positive displacement vacuum blower to pull spoils to the tank via a boom. The boom has a 342-degree rotation and a 26-foot reach. All critical components are housed in an insulated and heated aluminum van body. Its mud sweep empties the tank without hoisting, which eliminates the dangers of dumping on uneven ground and around overhead power lines. 877/340-8141; www.tornadotrucks.com.