The invention relates to a device for controlling pressure level, comprising a housing (10) and a switch unit (12) formed on the housing (10) and projecting into the interior of said housing, in addition to a first membrane (14) separating a first interior space (44) of the housing that may be impinged upon by a pressurized fluid from a secondnterior space (46). According to the invention, the housing consists of a top part (18) and a bottom part (50) and a non-return valve (54) connected to the first interior space (44) of the housing and integrated into the bottom part (50) of said housing.