Application System Comprising A Connection Piece With A Filter Insert Arranged Therein And A Heating Hose Having Such A Connection Piece

An application system for applying a flowable medium to a substrate, wherein the application system has a heatable application device for applying the flowable medium to the substrate, a heating hose for supplying the flowable medium to the application device, and a filter insert, wherein the heating hose has an inner tube for conducting the flowable medium, wherein the application device and the heating hose are coupled to one another detachably via a connection piece, wherein the connection piece has an inlet end, which is fluid-connected to the inner tube and has an inlet opening for the flowable medium, an outlet end, which has an outlet opening, and a through-duct, which extends from the inlet opening to the outlet opening, for the flowable medium, wherein the connection piece has, at its outlet end, a coupling section, which extends in a straight line in an axial direction and is coupled to the application device, wherein the filter insert is inserted through the outlet opening in a straight line in the axial direction into a receiving section formed by the through-duct, wherein the filter insert has a filter structure through which flow can pass radially inwards from the radial outside or radially outwards from the radial inside, for filtering the flowable medium, and wherein the filter insert has a bearing section, which protrudes radially outwards relative to the filter structure, wherein the bearing section is arranged at least partially in the receiving section, for radially supporting the filter insert in the receiving section.