| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain pipe capable of sufficiently securing the residence time of drain within a septic tank, without incurring any increase in amount of excavation work when the septic tank is installed and also any increase in the manufacturing cost of the septic tank. SOLUTION: This drain pipe consists of a pipeline which is used for connecting a drain generation source to a septic tank and provided at a point midway between them, with a flow rate adjustment means.
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