Built-in anti-backflow device for drainage system
The utility model relates to the technical field of anti-backflow devices, and discloses a built-in anti-backflow device for a drainage system, which comprises a cylinder body, the top of the cylinder body is fixedly sleeved with a mounting ring, a pull rod penetrates through the outer edge of the m...
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| Format: | Patent |
| Sprache: | chi ; eng |
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