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1. Material: ABS 2. Opens when encountering water flow and automatically closes when there is no water to prevent sewage from seeping back. 3. Unilateral drainage to prevent cockroaches and rats from invading 4. Flexible cover, one-way outlet, water can be easily discharged 5. Sturdy and durable, waterproof and moisture-proof 6. No need to drill holes, just peel and use, stick firmly 7. Weight: 15 grams 8. Dimensions: 7.1x7.2x4.2cm
