Cast iron motor housing. Overloaded protected motor. Pumps 3240 gallons per hour. Sump pit diameter required: minimum 12"W x 22"D basin. 1/2 HP Cast iron motor housing Overloaded protected motor Pumps 3240 gallons per hour Sump pit diameter required: minimum 12"W x 22"D basin. WARNING: Cancer and Reproductive Harm - ww