Abstract: A flow regulating device, for insertion in an air fuel intake pipe of an internal combustion engine, comprising a sheet metal support having a number of cut-out portions therein so as to define, for the support, a peripheral mounting portion, an annular central portion having a central aperture and web portions between the mounting portion and the central portion for locating and supporting the central portion, and a metal gauze sheet secured to the sheet metal support covering the cut-out portions with a central aperture in the gauze sheet coincident with the central aperture in the sheet metal support.