Abstract: A tamper-proof cap for a container closure device for providing a visual indication of any tampering and tampering attempts with the container closure device includes an annular body portion, a pull ring portion detachably joined to the annular body portion, a tear-out strip portion joined to the pull ring portion and a pair of connecting membranes disposed between the tear-out strip portion and the annular body portion. The annular body portion includes an enclosing wall, an inwardly extending lid section joined to a top edge of the enclosing wall, and an outwardly extending lip section joined to a second opposite edge of the enclosing wall. The inwardly extending lid section is annular in shape and defines a center opening. The pull ring portion is detachably joined to the inner edge of this center opening by three reduced-thickness membrane sections which can be easily torn under nominal manual force.

Abstract: A cap-like closure device for a container which is arranged with a raised annular boss formed in one end to receive the closure device includes a flexible spout member secured to the raised annular boss by means of an anchor ring which is disposed overlapping the outermost edge of the flexible spout member and is crimpable to secure this outermost edge around the top lip portion of the raised annular boss. A resealable cap is provided which threadedly engages the top rim portion of the flexible spout and includes a depending annular groove in its top lip portion which is suitably sized to receive the top rim portion of the flexible spout to provide a secondary seal. Disposed over the resealable cap is a tamper-proof cap which is temporarily retained by the anchor ring, but which may be removed from beneath the innermost edge of the anchor ring by prying. Integral with the flexible spout member is a diaphragm which has joined thereto a pull tab ring member.