Patent ID: 8464882

Claim:
A venting unit assembly for a closed container having a lid and a container portion with a neck and a rim, the rim having at least three spaced apart notches, the unit assembly comprising: a venting unit comprising: a substantially rigid ring having a lid-interfacing surface; and a resilient annular valve member interfacing with the substantially rigid ring comprising a one-way valve adapted to be disposed at the inner wall of the neck, wherein the resilient annular valve member does not interface with the lid; wherein the substantially rigid ring has at least three spaced apart projections arranged correspondingly with the rim's spaced apart notches thereby forming a fixing mechanism for fixing said substantially rigid ring and said resilient annular member in place with respect to the container portion to prevent movement there-between including during closure of the lid; and wherein there is a gap between said projections and said notches thereby forming at least one air passageway between one of said projections and one of said notches of said fixing mechanism, the said assembly further comprising at least one air passageway leading from the ambient atmosphere to the one-way valve member; and a fixing mechanism adapted to prevent planar movement between the venting unit and the container, whereby the one-way valve seals at the inner wall of the neck when there is a pressure difference between the ambient atmosphere and the inside of the container, below a threshold pressure; and the one-way valve is opened when there is a pressure difference between the ambient atmosphere and the inside of the container above a threshold pressure.