Our EcoVac system combines proven technology, durable construction, quiet operation, and oil-free performance with the latest in water and energy-saving features.  We use a Variable Frequency Drive (VFD) to control vacuum levels. When no suction is needed, the motor runs at one third of its speed, consuming very little power. When a suction hose is used, the motor automatically speeds up to maintain consistent suction. No traps to clean, no oil to check or change, and reliable.