APV Vaccumizer Skid with SIHI Vacuum Pump. Inside straight wall dimensions: 1 ft. 6 in. dia. x 3 ft. 11 in. H.Approx tank volume: 50 gallons. Test vacuum: 18 in. Hg. Working vacuum: 12 in. Hg. Sihi vacuum pump. Model: LPHB3404 BN001012. Lincoln electric motor, 3 hp. Inlets: (1) 1-1/2 in. dia. flanged port, (1) 1 in. dia. port, (1) 1-1/2 in. dia. NPT fitting. Outlets: (1) 1-1/2 in. dia. flanged port, (1) 2 in. dia. S-line fitting. Overall dimensions: 4 ft. L x 4 ft. W x 7 ft. 2 in. H.