| 摘要 |
A rear vent, intended to enable the intake of air in a tube seal of the membrane type, comprised of a valve body (23), made of a material with rubber like properties and comprised of a shell or conical shaped part (25) that is designed to be sealing, inserted in an opening (12) in a wall and which presents a shaft (24) by which the valve body is controlled in relation to the opening in question. The shaft can present bulges (2) in order to fix the valve body in an axial direction through joint-action with a hole in a projection under the wall (5).<IMAGE> |
