| 摘要 |
PROBLEM TO BE SOLVED: To enable a duct to which a flexible annular gasket is outwardly fitted to be easily inserted into another duct.SOLUTION: A connection duct 20 to which a flexible annular gasket 30 is outwardly fitted is inserted into an outlet 14 to cause these connection duct 20 and the outlet 14 to be connected to each other. The outer peripheral surface of the connection duct 20 is formed with a protrusion 24 extending along a peripheral direction. The gasket 30 has an expanded diameter part 31 held between the outer peripheral surface of the protrusion 24 and the inner peripheral surface of the outlet 14 and a diameter reduced part 32 of which diameter is shrunk more than that of the expanded diameter part 31, and a shrunk diameter part 32 of which the inner diameter is shrunk more than that of the expanded diameter part 31 that is outwardly fitted to a location adjacent in an axial direction to the protrusion 24 at the outer peripheral surface of the connection duct 20. |
