A primary nurser assembly for mounting over an opening in a container comprisingPPA DAM MEMBER INCLUDING A LOWER WALL SPANNING THE OPENING IN THE CONTAINER AND A RADIALLY OUTWARDLY DIRECTED FLANGE OVERLYING THE AXIAL END FACE OF THE CONTAINER ADJACENT THE OPENING, SAID LOWER WALL HAVING A PORTION AT LEAST PARTIALLY DETACHABLE TO PROVIDE AN ACCESS PASSAGE FOR DISCHARGE OF THE CONTENTS OF THE CONTAINER, P PA NIPPLE FOR MOUNTING OVER THE OPENING IN THE CONTAINER HAVING A STRETCHABLE LOWER BASE PORTION ADAPTED TO SURROUND AND OVERLIE OPPOSITE FACES OF SAID FLANGE, ANDPPMEANS FOR SEATING SAID LOWER TERMINAL EDGE PORTION OF SAID NIPPLE AGAINST THE AXIAL END FACE OF SAID CONTAINER TO PROVIDE A SEAL THEREBETWEEN.
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