Norwesco 43499: 750 gallon seamless double compartment low profile green plastic septic tank. No assembly, special backfill or water filling required. Capacity: 750 Gal Diameter: 60 in Height: 51 in Weight: 291 lb Material: High Density Polyethylene (HDPE) Color: Green Lid/Manway: 2-20in Manway Specific Gravity: 1.0 (Water Only)