| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain pipe and an exhaust pipe for sink capable of preventing the leak of odor. SOLUTION: Drain pipes 4, 7 and an exhaust pipe 8 to be mounted under a sink are wrapped with an airtight polyvinylidene chloride film 20 over the whole length, whereby the leak of odor through the pipe walls of these pipes is prevented, so that no offensive small is stayed under the sink.
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