Product Features & Benefits Dual voltage operation 110-120V / 220V 50/60Hz Exceptional ultimate vacuum rating as low as 50 microns Advanced air cooled motor design for operation in high ambient temperatures Proprietary oil mist free exhaust port cap for clean, safe job environment Gas ballast valve speeds achievement of deep vacuum Multiple port connections for ¼”, ?” and ½” ACME Easy maintenance with large oil sight glass and fill port with easily accessible oil drain port. Solid rubber base provides extreme shock resistance Sure-grip handle ergonomically designed for superior comfort and portability Proprietary spring-activated polymer-based exhaust valve enables a 99.999% seal on the discharge port of the vacuum pump mechanism Improved materials selection including hardness and additives, reduces wear and prevents galling.