Abstract: An ignition plug suitable for igniting meager fuel vapor/air mixtures has a tubular metal housing, an insulating body which is divided into longitudinal portions and contains a connection pin and a middle electrode positioned in its through borehole. A longitudinal portion of the insulating body, which longitudinal portion is enclosed by the metal housing, consists of dielectric material and, together with the metal housing and the connection pin, forms a capacitor which has a capacity of 120 to 500 pF, chiefly 200 to 400 pF. In order to connect electrial flashovers between the connection pin and the metal housing in the areas of the separating surfaces of the insulating body annular electrical insulating elements are arranged between the separating surfaces which are made of the material elastic at all temperatures of the ignition plug.

Abstract: A filter for liquid fuels wherein a flanged end portion of the metallic case for filter elements is embedded in or bonded to the reinforced open end of a transparent injection-molded plastic cup. The connection includes an elastic plastic liner which may constitute a barrier against any direct contact between the cup and the case or is disposed between the inner side of the end portion of the case and a raised annular portion of the open end of the cup. The liner compensates for differences between the thermal expansion coefficients of the materials of the case and cup and insures that the connection is not only leakproof but also resistant to relatively high fluid pressures in the filter. If the end portion of the case is bonded to the open end of the cup, it has an inwardly extending collar which overlies a bead of the open end; the liner then consists of hot melt and fills a gap between the inner side of the collar and the adjacent shoulder of the bead.