| 摘要 |
A coupling to connect together, for instance an exhaust pipe and another pipe comprises a relatively rigid outer wall (1) and a relatively flexible inner wall (2) formed as a jacket with a through-going hole (3). The walls (1,2) are joined with the ends (4,5) of the coupling, and the walls (1,2) are at one end (4) vulcanized together where a valve (6) is led to an airspace (7) between the walls. In inspection halls and garages there is a need for coupling the exhaust pipe of a car and a pipe together, both for conducting away the exhaust gases during the work and for emission testing. <IMAGE> |
