ATEX-certified for use in explosive or dangerous environments, S Series includes self-priming, double-ended, positive displacement pumps. Twin Screw Pumps (WTG) are double-suction, self-priming, twin-screw pumps with external bearings and timing gear transmissions; Twin Screw Pumps with non-timing (NTG) gear transmission feature single-suction design; and self-priming Triple Screw Pumps handle clear lubricating liquids without solid content.