Nash Vacuum Pump. Size: MHF-50. Test No. 83U2312. Capacity for new pump is 47 cfm with a vacuum range of 0-27 Hg. Discuss with salesperson your process to determine if this pump should handle your specific duty. Maximum speed: 1750 rpm. General Electric motor, 3 hp, 230/440 V. Inlet: 2 in. dia. FNPT. Outlet: 1-1/4 in. dia. FNPT. Overall dimensions: 1 ft. 6 in. L x 1 ft. W x 11 - 1/2 in. H. (ACN51a)