PRACTICAL FUNCTIONS - The floor drain filter features an automatic closing design that effectively blocks bugs, seals unpleasant odors from sewage, prevents drain water from backing up into the room, and helps prevent water leakage and overflow. UNIQUE DESIGN - The floor drain has a V-cup shape to ensure efficient drainage and faster water flow. The unique S-shape automatic closing mechanism helps prevent backflow, keeps out foul odors from the sewage pipe, and blocks bugs. APPLICATION RANGE - Suitable for use with floor drains in shower rooms; effectively prevents backflow, odors, and sewer gases. ENVIRONMENTALLY FRIENDLY - Made from eco-friendly materials; odorless and non-toxic; promotes health safety; resistant to deformation after stretching, highly flexible; long-lasting and durable; provides strong corrosion resistance. INSTALLATION GUIDE: 1. Measure the internal diameter of the drain opening to ensure proper fit. 2. Measure the depth of the drain pipe. 3. Install the floor drain one-way valve. 4. Due to the soft and sticky nature of silicone, gently hold the drain grate open during first installation to ensure proper water flow. Color: Blue Material: Silicone Size: 9.5 x 5 cm, 6 x 5 cm Port diameter: 5.5 cm PACKAGE CONTENTS: 4 x Silicone Drain Backflow Preventer 4 x Stainless Steel Strainer 4 x Stainless Steel Retaining Ring Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement may vary by +/- 1-3 cm.