Aurora Centrifugal Pump. Aurora Centrifugal Pump. Type: 341A BF. Flow rate for new pump is 560 gpm with required horsepower and pressure. Electric motor: 480V. (1) 4-1/4 in. flange inlet. 8 mounting holes ½ in. dia. Adjacent: 2-7/8 in. opposite: 7-1/2 in. (1) 4 in. flange outlet. 8 mounting holes ¾ in. dia. Adjacent: 2-7/8 in. opposite: 7-1/2 in. Overall dimensions: 2 ft 3-3/4 in. L. x 1 ft. 4 in. W. x 1 ft. 1 in. H.