Patent ID: 7887701

Claim:
A filter assembly, comprising: a housing including a housing bottom portion; at least one ring filter element that is received by at least one receiving space defined at least in part by the housing, wherein the receiving space includes a receiving space bottom portion; a cover attached to the housing bottom portion and configured for at least partially enclosing the at least one receiving space and the ring filter element, wherein the at least one receiving space may be selectively emptied when the cover is removed; an outlet located at the receiving space bottom portion within the cover; and a closure located on the at least one ring filter element, wherein the closure is configured to at least partially close the outlet when the at least one ring filter element is inserted into the at least one receiving space, wherein the filter assembly includes a ramp having a lower end and an upper end, the ramp is connected to one of the cover and the at least one ring filter element, and wherein the closure is created by a cap that opens axially towards the exterior of the filter assembly, and the outlet includes a connecting piece for protruding axially into the at least one receiving space, and penetrating axially into the cap for at least partially closing the outlet.