Patent ID: 8821734

Claim:
An oil purifying liquid filter, comprising: an annular ring element having a receiving space, wherein the ring element has a first and a second axial end disks, a cover selectively fastened to a housing to close the receiving space, an inlet that is formed within the housing on a crude side, an outlet that is formed within the housing on a pure side, and the outlet includes a nozzle with an inner surface and an outer surface, a first additional opening that is formed within the housing, a second additional opening that is formed within the cover, a first closure that is formed on the first end disk of a filter element to selectively close the first additional opening, a second closure that is formed on the second end disk of the filter element to selectively close the second additional opening, and a seal, wherein the first end disk has a central opening through which the nozzle projects axially into the interior of the filter element, thereby communicating the receiving space with at least one of the inlet and the outlet, and wherein the seal is disposed between the first axial end disk and the outer surface of the nozzle, wherein the second closure is formed by a cap that is axially open on one side, and the second additional opening is formed on an axially projecting nozzle that penetrates axially into the cap in order to close the second additional opening.