OPW offers the leading line of Composite Manholes on the market for use at petroleum retail operations and commercial and industrial driveway applications. Lightweight and durable, our composite covers are available in a wide range of shapes and sizes. From general tank sump access to multiport and single port fill sump applications, to interstitial sumps and monitoring wells, we have every application covered with watertight and easy to remove options. Plus, multiple colors are available!