guide element and a second guide element may be disposed on the other of the first region and the second region the guide contour may include a first axial groove and a second axial groove configured to receive the first guide element and the second guide element to define a key and lock interaction application_number US 201414767731 A description fig1 shows a longitudinal section through a filter appliance 1 which can be configured for example as an oil filter 1 u2032 the filter appliance 1 has a filter housing 2 and a ring filter element 3 that is mountable into the filter housing 2 wherein in fig1 a state of the ring filter element 3 mounted into the filter housing 2 is illustrated the filter housing 2 has in addition a housing cover not illustrated here which with respect to the illustration shown in fig1 closes off the filter housing 2 at the top and is removable from the remaining filter housing 2 for example by a corresponding thread in order to enable a mounting and a dismantling of the ring filter element 3 in or respectively out from the filter housing 2 the ring filter element 3 has on its side facing away from the housing cover a lower end disc 4 on which is arranged a pin 5 arranged eccentrically and protruding axially from the lower end disc 4 in the assembled state the pin 5 engages into a channel 6 of the filter housing 2 which in particular can be constructed as a discharge channel 6 u2032 which.