| CPC B65D 47/148 (2013.01) [B65D 25/48 (2013.01); B65D 47/065 (2013.01); B65D 51/1611 (2013.01); B65D 2205/00 (2013.01)] | 11 Claims |

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1. A one-piece spout device, attachable to a container opening, the one-piece spout comprising:
a spout body having a bottom end with a bottom opening and a top end, the top end having an outer surface and a top opening;
a cap portion affixed to the bottom end, the cap portion being sized and adapted to releasably connect said one-piece spout to said container;
an air-vent portion comprising a first end and a second end, the first end being affixed to the top end of said spout body, and the second end being attachable to the top opening of said top end, the second end comprising a vent opening for partially covering said top opening;
wherein the first end and the second end of said air-vent portion are attached by a tether element;
wherein the top end of the spout body comprises one or more fin elements, said one or more fin elements encircling the outer surface, the fin elements being adapted to create a tight seal with said second end of said air-vent portion; and
wherein the cap portion and the spout body are of a one-piece molded construction formed from nitrile rubber.
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