1990 Viking Rotary Pump. Model: AK125. Flow rate for new pump running at 1000 rpm is 50 gpm. This is currently set up to run approximately 25 gpm with a final rpm of 500. Discuss with salesperson your process and product to determine if this refurbished pump should handle your specific duty. This pump features positive-lock thrust control for exact rotor and shaft positioning, and the revolving casing permits selections of port arrangements at 45 or 90 degree angles. Inlet/outlet: (2) 2 in. dia. NPT (male). Overall dimensions: 4ft. 5 in. L x 15 in. W x 17 in. H.(ACN49).