Bell & Gossett Centrifugal Pump. Series: 3530. Rated capacity for new pump is 24 gpm with required horsepower. Discuss with sales person your process and product to determine if this refurbished pump should handle your specific duty. Impeller diameter: 4-1/4 in. Franklin electrical motor, 1/2 hp, 2875/3450 rpm, 208-230/460, 3 phase. Inlets: (1) 1-1/2 in. dia. port. Outlets: (1) 1 in. dia. port. Overall dimensions: 1 ft. 1-3/4 in. L x 8-1/2 in. W x 9-1/2 in. H.