| 摘要 |
An improved tub box structure can be manufactured so as to utilize a container shaped so as to include a bottom wall and a top peripheral wall extending upwardly from the bottom wall, this peripheral wall sloping between its top and its bottom so as to diverge upwardly from the bottom wall. Knock out openings are provided in the bottom wall and in the peripheral wall for use in passing a pipe into the tub box structure. A lid capable of closing off the interior of the container is fitted into the top of the container so that it may be easily removed.
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