Sump Basin, Material Structural Foam, Capacity 11 gal, Vent Size 2 in, Inlet Dia. 1 1/2 in, Overall Height 14 in These sump basins are inserted into the sump pit to keep ground soil from entering the sump pit and clogging the sump pump intake. They are drum-shaped containers with a closed bottom, an open top with a lip that extends out, and a side opening for a pipe inlet.Sump basins, covers, and fittings keep dirt and debris from entering the sump pit and clogging the sump pump inlet. Sump pump basins fit into the sump pit to keep ground soil from entering the sump pit. Sump pump covers are placed over the sump pit basin to keep debris from falling into the sump pit from above. Fittings keep debris out of the sump pit by providing a tight seal around outlets and vent pipes.