A primary nurser assembly for mounting over the opening in a container comprising a dam member spanning the opening and having a detachable portion providing an access opening for discharge of contents of the container, a nipple means supporting the nipple in a position overlying the dam, said detachable portion being defined by scoring configuration providing two leaf sections, each pivotal about a hinge and being connected together adjacent the center of the detachable portion, means for actuating said detachable portion, whereby each leaf section is pivoted downwardly about its hinge connection and the pivotal displacement is limited by said central connection.
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