Motor only, not base. Single Phase, high efficiency, premium moisture resistant insulation system. Suitable for high moisture applications. Heavy-duty bronze bearing. 5/8 In. shaft diameter fed by an extra large reservoir of oil, ensures long life. Permanently lubricated sleeve bearings. Thermal overload protected. Motor is permanently lubricated during production, no relubrication is required. Superior starting switch features rust inhibiting materials and coatings. Motor rotates clockwise when looking at the shaft. Please double check that you unit uses the same rotation motor. 100% copper windings. UL (Underwriters Laboratories) approved construction. Will fit Master Cool, Aerocool, and UltraCool.