Zoeller sewage sump pump basins feature high-density polyethene structural foam (PSF) / polyethene / fibreglass seam-free construction ideal for collecting the flooded water from HVAC equipment, basements and pressure sewer systems. These IAPMO approved sewage basins are watertight and gas-tight when properly installed, and come with a durable steel cover with gaskets, two pump plates and an inspection plate (on simplex and duplex sewage basins) for keeping the accumulated water covered and providing inline, easy maintenance services, respectively. The brand's basins are designed for use in applications where the saturated soil hydrostatic pressure do not extend above the top of the pit unless the pressure is relieved by an independent drainage system. Choose from a wide range of these sump pump basins available in 18 and 24 inch diameter options on Raptor Supplies.