Secondary element and filter system

A filter system for filtering a fluid, the filter system comprising

• a housing;
• an inlet socket arranged at the housing for supply of a fluid to be filtered;
• an outlet socket arranged at the housing for discharge of a filtered fluid;
• a filter element arranged between the inlet socket and the outlet socket;
• a central tube arranged in an interior of the housing along a longitudinal direction of the filter system and configured to receive the filter element;
• a secondary element arranged in an interior of the filter element, wherein the central tube carries the secondary element;
• wherein the secondary element comprises a first connection device and wherein the central tube comprises a second connection device, wherein the first connection device and the second connection device are complementary to each other and configured to connect an end of the secondary element and an end of the central tube to each other;
• wherein the secondary element comprises a closed end disk arranged at the end of the secondary element;
• wherein the first connection device of the secondary element comprises lock elements arranged distributed on an outer circumference of the closed end disk, wherein the lock elements comprise radially inwardly oriented lock hooks;
• wherein the second connection device of the central tube comprises a circumferentially extending collar arranged at the end of the central tube;
• wherein the lock elements, in an intended mounted state of the secondary element on the central tube, are locked by the lock hooks at the circumferentially extending collar and fix the secondary element in the longitudinal direction of the filter system;
• wherein the central tube comprises at least one deflection element arranged at the circumferentially extending collar, wherein the at least one deflection element is oriented radially outwardly;
• wherein the lock elements include two directly neighboring lock elements, wherein a distance of the two directly neighboring lock elements along the outer circumference of the closed end disk is larger than a measurement of the at least one deflection element measured in a circumferential direction of the circumferentially extending collar.