A unit (10) for the regulation or control of a fluid pressure, comprises at least one housing section (13, 14) and a switching film (22) connected to the at least one housing section (13, 14) for switching at pressure differentials relative to an ambient pressure acting on the switching film (22), and for the regulation, release or blocking of a flow of the fluid between an inlet (28) and a discharge (30) for the fluid. The switching film (22) is made out of a polymer material having fluorine and carbon, in particular a thermoplastic having fluorine and carbon. In this arrangement, a hole cross-section (40) of the at least one housing section is closed off by the switching film. The invention further relates to a method for connecting the switching film of the unit (10) with at least housing member in a fluid sealing manner, wherein a jointing region (42) which is outwards arranged in the radial direction of the switching film is provided with a connecting element (44), wherein the connecting element is connected with at least one housing in the area of mating surfaces (50,52) at least.