LubeFree and waterless Small footprint Quiet operation Open frame design for ease of maintenance Stackable units for easy expansion Auto shut down procedure to ensure longevity of rotary vanes 5 Year Warranty Benefits for Replacing Water Ring Systems: Dry system reduces water and sewage costs- Saves Money! No traps to clean Consistent vacuum levels when one or more HVE’s are opened Easy installation Able to adapt easily to most existing plumbing (3/4? – 2?)