| 摘要 |
A one-way diaphragm for use in combination with the drain of a sink, for example, is provided with a plurality of axially extending, radially oriented, double thickness flanges which are corrugated throughout substantially their entire length. The lower end of each of the flanges is split whereby water draining from the sink can flow therethrough. The diaphragm is made of resilient material so that the flanges are normally closed and provide a seal at their lower end to prevent backflow of any gases, fluids and foams into the sink.
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