| 摘要 |
PURPOSE: A sleeve hose for dredging is provided to check the abrasion of a color layer by pulling out a plug from a checking window. CONSTITUTION: A sleeve hose for dredging comprises a straight hole, a pipe, a plug(300), a yellow layer(104), and a red layer(105). The straight hole is formed to be extended to the yellow layer. The pipe is inserted into the straight hole and formed into a single body with the sleeve hose. The plug is thread-fitted with helices(301). The yellow and the red layers are formed into a single body in the lower portion of the plug. |
