In order to acoustically seal a spray cap, a cap 7 is provided with a button 6 having an elastic connection 49 between button 6 and cap 7 in order to achieve an acoustic seal 49 of cap 7. In this context, seal 49 is designed as a crimped device. A hinge 5 of button 6 is formed in an analogously crimped manner in order to be able to actuate it together with seal 49 in a smooth-running manner.