2001 Buffalo Pumps Can-o-Matic Ammonia Pump. Model: COM. Size: 4x3x13. Flow rate for new pump is 600 gpm with required horsepower and pressure. Discuss with salesperson your process and product to determine if this refurbished pump could handle your specific duty. Impeller diameter: 13 in. Motor, 20 hp. Inlets: (1) 4 in. dia. flanged port. Outlets: (1) 1-1/2 in. dia. flanged port. Overall dimensions: 2 ft. 3 in. L x 1 ft. 9 in. W x 2 ft. H.(ACN116)