Single Stage Block Type Vacuum Pump. A compact design of single stage vacuum pump from IMI Norgren that uses 14% less air than comparable units. Suitable for filtered, non-lubricated compressed air these vacuum ejectors are easy to install and can be directly connected to suction cups and piped exhausts. Features ; Benefits. No wearing parts Compact Design Quiet operation Anodised Aluminium casing Brass Nozzles 5 bar optimum operating pressure