The invention relates to a magnetic actuator (111) for a conveying unit (110), in particular a diaphragm pump for an operating medium/auxiliary medium in a vehicle, comprising a spring-loaded armature (118), which extends through a solenoid (14) and acts on a diaphragm (117), wherein the diaphragm can act on a working space (120) of the conveying unit and/or can cover or uncover a sealing seat (48) of a valve (130), wherein the diaphragm (117) is connected to the armature by means of an intermediate layer (119).