| 摘要 |
PROBLEM TO BE SOLVED: To facilitate external fitting and mounting working to a waste plug body 4 of a triangular packing. SOLUTION: In a waste plug 13 externally fitting and mounting an overflow adapter 14 on an outer peripheral face of the cylindrical waste plug body 4 and performing watertightness between the waste plug body 4 and the overflow adapter 14 through the triangular packing 9, when the triangular packing 9 is tightened since a shape of a contact part of the overflow adapter 14 contacted on the triangular packing 9 is performed so as to be linear contact to the triangular packing 9, which is largely pushed to a diameter contraction direction by a linear contact shape of the overflow adapter 14, the inner peripheral face of the triangular packing 9 is strongly brought into pressure-contacted to the outer peripheral face of the waste plug body 4 to secure watertightness. Thus, an inside diameter size of the triangular packing 9 can be set larger than an outside diameter size of the waste plug body 4, and the external fitting and mounting to the waste plug body 4 of the triangular packing 9 is easy.
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