| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain piping with can eliminate the bad smell from a drain port, reduce the drain pollution by a cleaning operation and replace easily. SOLUTION: The U-shaped trap of a drain piping is composed of the next three kinds and five parts and connected to an existing pipe 1, 1. Here, a vertical pipe 2, 2 with the same diameter and thread connected to the existing piping 1, 1 is connected to the U-shaped part 4. In bands 3, 3 fastening the U-shaped part and vertical part in a watch step type and the U-shape part, a ceramics stone 5 which has a drain cleaning action is fillingly equipped as a standard specification.
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