Fiberglass sump and sewage basins are available with 96-in. (capacities from 3,008 to 7,520 U.S. gals.) and 120-in. (capacities from 4,700 to 11,750 U.S. gals.) inside diameters. Largest internal diameter ever offered by manufacturer. Fiberglass basins are manufactured to ASTM D3753. Basins available in varying heights to meet specific applications. One-piece tanks are available as deep as 35 ft. Topp Industries Inc., Rochester, Ind.