| 摘要 |
PROBLEM TO BE SOLVED: To improve the aspect of sanitation by preventing washing place side waste water from flowing backward in a bathtub, in a drain structure of a bathroom unit having a structure for merging waste water from the bathtub with waste water from a washing place. SOLUTION: This drain structure of the bathroom unit is formed by connecting a drain port 11 of the bathtub 10 to a drain port of a washing place pan via a drain pipe. A backflow preventive drain valve 13 for preventing a backflow of the waste water, is stored in the drain pipe 12 positioned in the vicinity of the drain port 11 of the bathtub 10. COPYRIGHT: (C)2006,JPO&NCIPI
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