New Ball bearing, 12-Volt Motor and harder longer lasting brushes. Many years of experience and know how have gone into the design of this heavy- duty 12 volt agitator which is fan cooled, 3000 rpm, 1/20 hp, 5 amps with spinner stop. It has a large splash washer on shaft underside of motor, high impact plastic paddle with 5/16” shaft, heavy-duty bearing insert in bottom of 9" x 4 or 10 1/2" x 4" basket. There is a band around the top of basket for reinforcement and longer life. The arrow on the motor indicates proper direction of rotation, which is a MUST and factory service life of unit is approximately 2,200 hours. Wt. 8 lbs. Each/ Box of 4 = 28lbs. The 90PS has the old standard 9" paddle blade. The 90APS has the old standard 10 1/2" paddle blade.