Viking Pump's line of Mag Drive® Magnum(TM) sealless pumps features a thrust-controlled design that allows short-term run dry capabilities. The design all but eliminates damage resulting from priming and accidental empty tank situations. These cast iron, reversible-direction-of-flow pumps are ideal for hazardous or hard-to-seal liquids, or for applications where very low maintenance is a requirement. The adjustable rotor clearance enables high volumetric efficiency, whether pumping thin or viscous liquids. Viking Pump.