A fully recyclable valve housing adapted for engagement with a neck of a container such as a beer keg, has an inner port (25) for liquid and a concentric outer port (14) for pressurised gas, with openings (21) for admitting pressurised gas into the container. A dip tube (5) is connected to a bottom end fitting (4), communicating with a valve stem (8) within the valve housing. A valve member 6 is arranged to control flow through the concentric ports, and a spring element (7) located about the valve stem (8) urges the valve member upwards to close the ports. The spring element (7) is moulded from a resilient polymeric material and comprises a plurality of C-shaped sections (7a) angularly arranged in two interconnected stacks on opposite sides of the valve stem such that movement of the valve member (6) by means of a valve-operating member causes concurrent resilient deformation of all the sections.