Model with pre-feed hopper, auger screw and blade bridgebreaker for dense products, blocks or pieces which tend to form a bridge over the auger screw. The blade bridge-breaker with separate gearmotor breaks up the product to be pumped, dislodging any clogs which might develop, taking the product towards the pre-feed screw. As with the "MC" series, these pumps are available with a closure cover.