Stainless Steel Single Shell Tank-500 Gallon. Inside straight-wall dimensions: 3 ft. 4 in. dia. x 8 ft. H. Manway diameter: 1 ft. 6 in. dia. Inlets: (1) 1-1/2 in. dia. port. Outlets: (1) 2-1/2 in. dia. port, (1) 2 in. dia. ACME fitting, (1) 2 in. dia. overflow port, (3) 4 in. dia. I-line fittings, (3) 2-1/2 in. dia. ports, (1) 2-1/2 in. dia. ACME fitting. Overall dimensions: 4 ft. 2 in. L x 3 ft. 2 in. W x 10 ft. 8 in. H.