a method and device for molding a door seal , such as for an automobile . the device is provided with a first extrusion passage for extruding a molding material into a hollow portion of the door seal . a second extrusion passage is provided for extruding molding material into a bridge which spans across the hollow portion of the door seal . a molding material discharge member , such as a pipe , is movably inserted into the molding die and can be moved between open and closed positions relative to a molding material supply passage for permitting material to be intermittently extruded through the second passage , whereas material is substantially continuously extruded through the first passage , thereby permitting the bridge to be molded to the hollow portion at selected locations therealong .