a double - valved closure for a container , particularly a beer container , comprises a cup assembly for insertion into the opening of the container and includes a tubular component of plastics material having legs between which a reaction ring can be sprung during assembly of the closure . a downtube is received in the ring and extends from the lower end of the cup assembly into the container and surrounds one of the valves and a spring biasing the valve closed . the valve is carried by the top of the downtube and the reaction ring provides an abutment for the spring for this other valve and which biases the valve closed . the legs are held together after insertion of the reaction ring by means of an outer ring engaging external grooves in the legs .