Leeson Totally Enclosed Fan-Cooled Enclosure DC Gearmotor. Worm-type right-angle gearing features hardened, steel worm with bronze worm wheel for long life and quiet operation, Single piece die cast aluminum alloy housing is vacuum impregnated with Resinol RT for protection and sealing, Light weight gearbox combines high tensile strength along with being precision machined for alignment of bearings and gearing, High temperature Nitrile seals for optimum seal life, Gearbox provided with solid output shaft, but can be converted to a hollow output shaft. Simply remove the solid shaft by removing the Snap rings - Leeson Bravo™ Totally Enclosed Fan-Cooled Enclosure DC Gearmotor