A filter appliance may include a ring filter element arranged upright in a filter having an upper end disc and a lower end disc. A component may be arranged on the lower end disc and may include at least one of a water collection pot, a projecting nipple-shaped pin and at least one key profile. A function element may be configured to be inserted in a filter housing pot of the filter appliance, the function element including a channel configured to receive the component. A lock profile may be provided on the function element, wherein the lock profile corresponds to the at least one key profile of the lower disk. The filter appliance is may be operational provided the pin engages the channel and the key profile engages in the lock profile.