A primary nurser assembly for mounting over en opening in a container comprising a dam member having a lower wall spanning the opening in a container and a radially outwardly directed flange overlying the container adjacent the opening, said lower wall having a portion at least partially detachable to provide an access opening for discharge of the con-tents of the container, a nipple having a lower terminal edge portion surrounding said flange, and an outer cover assembly sealing at least the detachable portion of said dam and said nipple and having a portion operable to seat the terminal edge portion of said nipple surrounding said flange against the container adjacent said opening to provide a seal therewith.
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