The pumps are Oil Recirculation, Single or Double Stage, Air-Cooled and Direct Driven. They are compact in design and reach a very good ultimate vacuum. Easy installation due to air-cooling without any cooling water requirements. The pumps are direct driven, so they do not require belts. They are available in a standard version and in a SV-version which has a vacuum safety valve and a manometer on the pump inlet. On special request we can supply them also in an version with a gas ballast valve for pumping of condensable gasses.