... producing experience air duct joint 1:Section Drawings:1,bolt 2,nut 3,gasket 4,inner race flange 5,corrugation pipe 6,dorsal ... plate flange 7,inner sleeve pipe flange 8,outer sleeve pipe flange 9,outer sleeve pipe 10,o-ring seal 11,inner ... wide: -40~-300°C5:Types and Marks:F:product code(air duct)U:product code(waveform) B:Produt code(corrugation) 6:connection ...