The invention relates to a system consisting of a cap for fastening on a foam can, or generally on a container, that contains a pressurized or pressurizable medium, as well as a tilting valve and a dispenser. The tilting valve comprises a sealing part that can be connected to the container and a valve nozzle interacting with the sealing part. The cap can be fastened on the container in the area of the tilting valve. The dispenser has a fastening area by means of which it can be fastened on the valve nozzle through a central opening of the cap. For easy mounting of the dispenser on the valve and for its actuation, provision is made for the inner area of the opening of the cap and the outer area of the fastening area of the dispenser to display positively interacting areas that, in tilted position of the dispenser relative to the container, create a positive fit opposing removal of the dispenser in the axial direction of the tilted position and detachment of the fastening area of the dispenser from the valve nozzle of the tilting valve.