| 摘要 |
A check valve (10) for attachment to a drainage port of a hollow extruded window frame includes a flexible membrane (16) and aperture (14) for communication with the drainage port. The membrane is biased against the aperture. When pressure against the flexible membrane (16) exists, the flexible membrane (16) moves to allow flow of water or condensation from the drainage port. External pressure causes the membrane to close against the aperture.
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