Self-resealing venting elastomeric closure for use with oral syringes, pipettes and the like

A self-venting self-resealing pre-cut elastomeric closure comprising a septum disc of elastomeric material including a dished septum encompassed by an annular rim area, a diametric cut across said dished septum, said diametric cut having opposite ends in said annular rim area outside said dished septum, and a pair of mutually parallel chord cuts in said annular rim area, each of said chord cuts having a chord cut end connected to a corresponding one of said opposite ends of said diametric cut at an acute interior angle thereby to define flap areas in said annular rim area outside said dished septum, said flap areas being elastically displaceable from a normally closed co-planar horizontal condition to a downwardly flexed open venting condition in response to insertion of a liquid transfer implement such as the tip of an oral syringe or a pipette through said dished septum such that pressure may be equalized by air flow through the flexed open flap areas while drawing liquid from a container closed by said septum disc;