Roots RAM, RAM J, RAM GJ and TRILOBE AM-X blowers, are recognized as the most volumetrically efficient blowers in the industry. All standard units are center-timed to allow rotation in either direction. Units are available in frame sizes 404 thru 624, and all models feature "universal" mounting feet, which allow each unit to be mounted in four different configurations (top, bottom, left and right-hand configurations). Piston ring seals reduce leakage through shaft opening in located within the headplates. Additional lip seals prevent lubrication from inadvertently entering the air chamber.