Filling the pit

When filling the pit, make sure the pump chamber is continuously in a plumb-vertical and constant position. Examine for any deformation or other indications of installation errors. Use a shovel or hand rammer to manually fill and compact the space next to the pump chamber wall, the cover flange, and the extension. Prevent the chamber and any pump chamber extension from rising. If necessary, fill the pump chamber with water before filling and compacting the pit.