Ring filter element

A filter device, comprising a filter housing and a ring filter element arranged in the filter housing, the ring filter element including:

• a connecting region;
• an axially projecting pin including an arm, the arm connecting the pin to the connecting region and including a predetermined breaking point disposed spaced apart from the connecting region;
• wherein a free end of the pin includes a closure element having a tapered end portion;
• wherein an outer diameter of the closure element is larger than an outer diameter of the arm;
• wherein the filter housing includes a passage structured complementarily to the pin;
• and
• wherein operation of the filter device is exclusively possible when the pin engages in and closes the passage.

A ring filter element for a filter device, comprising:

• a connecting region;
• an axially projecting pin including an arm, the arm connecting the pin to the connecting region;
• the arm including a predetermined breaking point disposed spaced apart from the connecting region;
• wherein at least a portion of the arm is defined by a plurality of webs structured and arranged to provide the arm with a cruciform cross section;
• wherein the plurality of webs each have a width extending in a circumferential direction;
• and
• wherein at least one web of the plurality of webs includes a portion in which the width decreases in a direction extending away from the connecting region.