FANSHENG | Anti-odor Three-in-one Floor Drain

The previous sink pipe was just stuck into the drain, and in summer, it smelled really bad, which was a hassle for a long time. I bought this one-way check valve out of curiosity. The outer shell is clear, and you can see the odor-proof core inside. When water flows, it pushes it open for normal drainage, and when the water stops, it automatically closes, which is a really clever design. The seller also mentioned that it prevents backflow and keeps bugs from crawling up, making it super practical!