Abstract: A beverage container assembly (28) comprising a container body defining a beverage chamber for containing a beverage, and a gas reservoir unit (1) adapted to be housed substantially within the container body (22). The gas reservoir unit (1) is adapted to be charged with a gas under super-atmospheric pressure whilst the reservoir unit (1) is outside of the container (22), and to retain the gas prior to insertion of the unit into the container body. A gas reservoir unit containing one or more chambers is also described.

Abstract: A device for continuously monitoring the difference in pressure of fluid in two closed spaces and separated by a dividing wall comprises an open-ended tubular housing which is secured to a rigid tube passing through and rotatably mounted in a horizontal passage in the wall with their axes inclined at an angle to one another. By rotably adjusting the housing with respect to the wall, the housing can be arranged to lie at a desired angle to the horizontal. The housing has a length three times its internal diameter and is transparent in end parts and opaque in a central part, each part being equal to a third of the total length of the housing. Two balls, each of a diameter slightly less than the internal diameter of the housing, are retained and free to roll within the housing, the ball remote from the wall being green and the other red.