Abstract: Aerator with a basic body (10) that can be connected to an air feed (50) pipe and with a diaphragm (20), which can be attached to the basic body (10) and whose edge (20r) can be fixed to the circumferentail surface (10r) of the basic body (10) by a static fastening part (30) for the diaphragm (20), which fastening part is designed such that it surrounds the edge (20r) of the diaphragm (20) in a positive-locking manner and can be fixed itself to the basic body (10) wherein the basic body (10) has, on its side facing a way from the said diaphragm (20), a centrally arranged air inlet area (12, 14), on which the fastening part (30) can be placed with a corresponding connection part (36).