| 摘要 |
<p>The box culvert (1) has a flexible tube (2) on which sealed and fixation flanges (3, 4) are placed at its ends, where the flanges are fixed and sealed on a hull of a boat and are equipped with an anti-raising water valve and a water deflector. The tube has an external surface with a part threaded and cooperated with an internal thread (6) of coupling sleeves (7) of the flanges. Trim covers (8) are associated to the coupling sleeves of the flanges. A screw thread (5) is formed on an external face of the tube and the internal thread of one coupling sleeve of one flange.</p> |
