| 摘要 |
PROBLEM TO BE SOLVED: To prevent wastewater from flowing back into other horizontal branch pipes when flow of energetic wastewater such as toilet wastewater is drained. SOLUTION: A plurality of horizontal pipe joints 6, 7 are provided on a side of a pipe body 2 inserted in a main riser 100. The pipe joints 6, 7 project in a direction crossing the pipe body 2 on a plane. Backflow prevention ribs 10-13 extending in the direction of the pipe axis are provided inside the pipe body 2. COPYRIGHT: (C)2004,JPO
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