A dielectric waveguide filter comprising a block of dielectric material including a plurality of resonators defined by a plurality of slots defined in the block of dielectric material. The tubular connector is fastened at the inner end to the exhaust tailpipe and provided with a fume channel via which exhaust fume is discharged into atmospheric air. The nozzle having an initially converging, subsequently diverging centrally disposed bore therein adapted to receive the mixed powder and gas from the mixing chamber and the nozzle holder including a cooling jacket which is thermally coupled to the nozzle adjacent the nozzle inlet and mechanically coupled downstream of the nozzle inlet. An adhesive material separates the flat conductors and an insulation layer surrounds the flat conductors and the adhesive material, with the adhesive material bonding to the insulation layer. The knockout pad may be movable relative to the seaming chuck, and may be configured to locate the can end prior to seaming. A sealed wire assembly is provided in the channel.