Container and venting mechanism assembly

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.