Our EcoVac system provides theadvantages of proven technology,durable construction, quiet operationand oil-free performance with thelatest in water- and energy-savingfeatures. This is not only importantto you as an environmentallyresponsible business owner, italso prepares your practiceforthe upcoming change to meteredwater usage in many areas of the country. We utilize a Variable Frequency Drive (VFD) to control thevacuum levels. With no suction being used, the motor isrunning one third the speed and using very little power.Every time a suction hose is being used the motorautomaticallyspeeds up to maintain constant suction.Maintenance free unit with no traps to clean, no oil tocheck or change. Truly a ZERO maintenance machine.