u shaped radial peripheral groove of the rotor 3 a switchable non return valve 30 embodied as a plate valve 31 is disposed within the annular chamber 29 the plate valve 31 comprises blocking elements 32 and 33 which are assigned to the side walls 34 and 35 respectively of the annular chamber 29 the two blocking elements 32 and 33 which are embodied as profiled annular rings 36 and 37 each have a first radially extending section 38 and 39 respectively by which the blocking elements are affixed on said side walls 34 and 35 of the annular chamber 29 diagonally extending sections 40 and 41 proceed from the radially extending sections 38 and 39 respectively and extend toward one another thereby forming an acute angle these radially extending sections 40 and 41 form second radially extending sections 42 and 43 which bear against one another in a sealing manner and therefore radially outwardly seal off the annular chamber 29 adjoining the annular chamber 29 is a working bore 44 which first extends radially and then axially into the end of which a coupling 46 connected to a working line 45 is screwed the consumer 5 is connected to this working line 45 to which said consumer compressed air shall be supplied or from which compressed air shall be removed during rotation of the rotor 3 fig2 presents a perspective sectional representation of the arrangement of the rotary feedthrough 6 between the stator 1 and the rotor 3 to.