Sihi Liquid Ring Vacuum Pump. Model: LPHB3704. S/N: BN-001 01 2. Part no. 2951486. Vacuum capacity: 20 in. Hg @ 25 cfm. Displacement capacity: 4 gpm. Lincoln Electric Motor, 3 hp, 1750 rpm, 208-230/460 V, 8.7-8.3/4.1 amps, 60 Hz, 3 phase. The SIHI "LPH" series liquid ring vacuum pump is reliable pump that can be used in a variety of applications. The vacuum pumps have one moving part, the impeller and shaft assembly, and no internal metal to metal contact. Sihi pumps offer operational safety, entrained liquid handling, long economical life, low vibration & noise level, low starting torque, and construction flexibility. Inlet/Outlet: (2) 1-1/2 in. dia. flanged port. Overall dimensions: 38 in. L x 14 in. W x 14-1/2 in. H.