【High-quality materials】: The Drain Backflow Preventer Made of ABS and Silicone Materials, Not Easy to Rust and Having Durability , Paired with a Filter Basket can Effectively Prevent Hair from Blocking Drainage. 【Rapid Drainage】:This Sewer Backflow Preventer Adopting Magnetic Double Opening Drainage, can Quickly Open and Close The Drainage, Effectively Preventing Backflow. 【Isolate Odors】:This Floor Drain Backflow Preventer has a Non-slip Silicone Ring Around The Edge so That Tight Fitting Floor Drain, Can Effectively Isolate Odors. 【Odor and insect protection】: ABS floor drains are designed to effectively prevent odors and insects. When water is present, the drain valve opens to allow water to drain under the effect of gravity, and when gravity is absent, the valve closes automatically, effectively preventing odors and insects. 【Wide Applications】:This Floor Drain Core is Suitable for many different applications such as toilets, bathrooms, kitchens, offices, washing machines, etc.