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A cap assembly comprising a body, a sealing membrane and a retaining ring. An opening is provided through the body and includes a recessed circumferential channel and a membrane engaging flange positioned proximate the recessed circumferential channel. The sealing membrane covers the opening and inc

A cap assembly comprising a body, a sealing membrane and a retaining ring. An opening is provided through the body and includes a recessed circumferential channel and a membrane engaging flange positioned proximate the recessed circumferential channel. The sealing membrane covers the opening and includes a body engaging flange and a pierceable surface. The retaining ring is positioned with the sealing membrane engagement surface in overlying engagement with the sealing membrane. Extension of the tab into the recessed circumferential channel of the body releasably maintains the overlying engagement and biases the retaining ring against the membrane. The inner wall structure of the retaining ring extends radially inward beyond the membrane engaging flange of the sealing membrane, to, in turn, protect the membrane.

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1. A cap assembly comprising: a body including a spout engagement channel defined by an outer circumferential flange and an inner circumferential flange spaced radially inward of the outer circumferential flange, and the inner circumferential flange defining an inner surface spaced radially inwardly

1. A cap assembly comprising: a body including a spout engagement channel defined by an outer circumferential flange and an inner circumferential flange spaced radially inward of the outer circumferential flange, and the inner circumferential flange defining an inner surface spaced radially inwardly of the spout engagement channel and opposite an outer surface of the inner circumferential flange, the inner surface defining an opening, with a recessed circumferential channel molded into the inner surface and a membrane engaging flange positioned proximate the recessed circumferential channel, such that the recessed circumferential channel is positioned between an upper end of the inner surface and the membrane engaging flange, the body being an integrally molded member;a sealing membrane covering the opening and including a body engaging flange and a pierceable surface, the sealing membrane positioned upon the membrane engaging flange so that the body engaging flange and the membrane engaging flange are in overlying engagement; anda retaining ring secured within the confines of the inner surface, the retaining ring including a body engaging tab, a sealing membrane engagement surface and an inner wall structure opposite the sealing membrane engagement surface, the retaining ring positioned with the sealing membrane engagement surface in overlying engagement with the sealing membrane, with the body engaging tab extending into the recessed circumferential channel of the body to sandwich, in sealed engagement, the body engaging flange of the sealing membrane between the sealing membrane engagement surface of the retaining ring, and the membrane engaging flange of the body, and wherein the inner wall structure of the retaining ring includes an inwardly sloping protective flange spaced apart from the sealing membrane engagement surface of the retaining ring and spaced apart from contact with the sealing membrane that extends radially inward beyond the membrane engaging flange of the body, so as to extend over a portion of the sealing membrane, the inwardly sloping protective flange spaced apart from the sealing membrane and positioned above the sealing membrane, to, in turn, direct a probe toward the pierceable surface. 2. The cap assembly of claim 1 wherein the spout engagement channel defines a generally inverted u-shaped configuration. 3. The cap assembly of claim 1 wherein the entirety of the retaining ring is within the inner surface and below the upper end of the inner surface. 4. The cap assembly of claim 1 wherein the body defines a top surface with the outer circumferential flange, the inner circumferential flange and the inner surface depending therefrom. 5. The cap assembly of claim 4 further including a sealing flange extending circumferentially on the top surface of the body. 6. The cap assembly of claim 1 wherein the outer circumferential flange, the inner circumferential flange and the inner surface are substantially concentric. 7. The cap assembly of claim 1 wherein the recessed circumferential channel is positioned on the inner wall radially inward of the spout engagement channel, between an upper end thereof and a lower end thereof. 8. The cap assembly of claim 7 wherein at least a portion of the membrane engaging flange is positioned radially inward of the spout engagement channel, between the upper end and the lower end thereof. 9. The cap assembly of claim 1 further comprising a cap removably positionable over the opening proximate the upper end thereof. 10. The cap assembly of claim 1 further comprising a lower guide wall portion extending inwardly from the inner surface, positioned on an opposite side of the membrane engaging flange from the sealing membrane, the lower guide wall portion limiting outward movement of the sealing member. 11. The cap assembly of claim 10 wherein the lower guide wall portion slopes inwardly. 12. The cap assembly of claim 1 wherein the sealing membrane includes a downwardly dependent sidewall extending between the body engagement flange and the pierceable surface, with the pierceable surface being between at least a portion of the lower guide wall portion and the membrane engaging flange of the body. 13. The cap assembly of claim 1 further including an inwardly sloping guide wall portion disposed above the recessed circumferential channel. 14. The cap assembly of claim 13 wherein the inwardly sloping guide wall portion is disposed above the retaining ring.