Fluid measuring or fluid control device

A fluid measuring or fluid control device, having a housing including a first and a second housing part fastened to each other by at least one screwed connection, the screwed connection comprising a screw having a screw shank and a screw head, an opening in a peripheral wall of the first housing part through which the screw shank engages, and a threaded opening in the second housing part which receives the screw shank, wherein an elastic seal having a peripherally circumferential edge region is arranged between the housing parts, and the first housing part has a first resting face and the second housing part has a second resting face, wherein in a non-assembled initial position, one of the housing parts has its resting face resting against the seal, and wherein the screw shank and an edge of the opening have cooperating frustoconical surfaces, wherein in the initial position, the opening in the peripheral wall and the threaded opening are radially offset to each other with their central axes and the frustoconical surfaces are oriented such that upon screwing-in, the frustoconical surfaces displace the two housing parts laterally to each other so that the resting face presses against and elastically deforms the seal.