The Appion TEZ8 was the first Vacuum Pump Designed from the Ground up with the Needs of a AC/R Technician in Mind. From the Multi-Port Input Tree to the 5 Second Oil Change, every Aspect of the TEZ8 is Designed for the Fastest Evacuation. With Clean Oil and Full Flow the TEZ8 can Save Hours, Save Days and Save Money! Features Include a 2 Stage Exhaust System that Vents without Breaking the Vacuum (no Gas Ballast Needed), a "Soft Start" Motor with Reliable Starting in Extreme Ambient Conditions as Low as -40 F and a Turbine Fan and Massive Aluminum Heat Sink that Keeps the Pump and Oil Cool, Reduing Oil Viscosity Breakdown