Sihi Multi-Stage Liquid Vacuum Pump. Model: AOHB3602 BN001010. S/N: 2693466. 2-stages. Grey iron construction. Self-priming. Maximum admissible pressure: 145 psi. Test pressure: 188 psi. Maximum admissible viscosity: 300 cST. Maximum speed: 1800 rpm. Applications include: boiler feed, pressure boosting, high pressure cleaning, waterworks and water supply, chemical and process, condensate systems, irrigation, heating, and reverse osmosis. Inlets/outlets: (2) 1-1/2 in. dia. FNPT with 5 in. dia. flanges, each with (2) 1/2 in. dia. attachment holes at a center-to-center distance of 2-3/4 in. Overall dimensions: 1 ft. 6 in. L x 8 in. W x 10-1/2 in. H.