Marlen vacuum stuffing and pumping systems are able to handle whole muscle, sectioned, formed, and emulsified. Marlen equipment includes twin-piston vacuum stuffers and pumps, hoppers, extruders, transducer portioning systems, depositors, vacuum fillers, grinders, forming systems, volumetric portioners, open hoppers, vacuumizing combo hoppers, load assist hoppers, auger hoppers, and Marlen parts.