an injection molded thermoplastic closure for a container having a generally planar wall and an integrally molded push - in tab within the area of the wall . the push - in tab has its boundary formed by discontinuities in the closure wall and the discontinuities are hermetically closed with a sealant applied locally in an arcuate pattern by rotation of the closure relative to a sealant applicator . a hinge line of the push - in tab has a construction that improves hinge integrity .