Patent ID: 7806258

Claim:
An insert for a multiple component container including an upper seal member, a depending annular wall sealed to the underside of the seal member, a depending spigot connected to the underside of the seal member and a movable wall carried by the depending wall, the seal member, the depending wall and the movable wall defining an interior space, the movable wall being movable with respect to the depending wall under the action of a pressure within the interior space and affording a discharge aperture, within which the spigot is slidingly and sealingly received, the interior space accommodating a movable piston member, which divides the interior space into two spaces, a gas space and an ingredient space below it, the outer edge of the piston member forming a sliding seal with the inner surface of the depending wall and a hole being formed in the piston member in which the spigot is slidingly and sealingly received, a gas supply pathway communicating with the gas space, the gas supply pathway being constructed to permit gas to flow from the exterior of the depending wall into the gas space but substantially to prevent flow in the opposite direction.