(3) Waukesha Model 220 Positive Displacement Pump. Model: 220. Flow rate for new pump is 310 gpm with required horsepower and pressure. Discuss with salesperson your process and product to determine if this refurbished pump should handle your specific duty. Maximum allowable speed: 600 rpm. Inlet/Outlet: 4 in. Overall dimensions: 1 ft. 11-3/8 in. L x 1 ft. 1-1/4 in. W x 1 ft. 7-1/8 in. H. (ACN174).