1000 Gallon Underground CisternA Custom Roto Molding (CRMI) cistern is a simple and surefire way of bringing your water costs down. From their prime purpose, which is holding water and storing it for future uses, cisterns are also utilized in a number of applications from toilet flushes, irrigation to deviating water from buildings and streets. Features: Capacity: 1000 Gallons 22" Gasket Locking Lid 2 x 2" Polypro Inlet Outlet fittings Manufactured using High Density Polyethylene