This Gasket is located in the valve opener under the water tank of the AEG Coffee Machines listet below. It is advisable to replace this water tank seal so that no water runs out of the tank under the device.
CF220 - CF250 - CF255 - CF260 - CF290 - CF350
Electrolux Caffè Perfetto
CP2200 - CP2500 - CP2700 - CP3300 - CP3500