High adaptability and compatibility make it reliable and practical. Simple and convenient installation saves time and effort. Anti-reflux and odor-resistant features enhance effectiveness. Multiple sizes allow selection based on individual needs. Made of plastic material for durable use. Available in three sizes: S, M, L. When water enters the floor drain, the water's weight opens the bottom ABS gasket, allowing smooth drainage. Once water flow stops, the ABS gasket closes automatically by gravity, creating a complete seal that prevents pipeline gases and overflow from rising. Helps block odors in summer and retains indoor air in winter. Item Name: Odor-proof Floor Drain Core Material: Plastic Features: Anti-reflux, Easy to Install, Fully Sealed Usage Instructions: S: Fits floor drains with inner diameter of 26-35mm, installation height over 43mm M: Fits floor drains with inner diameter of 36-42mm, installation height over 47mm L: Fits floor drains with inner diameter of 36-53mm or PVC pipe with 50mm inner diameter, installation height over 50mm Size Details: S: 4.3cm x 3.6cm / 1.69" x 1.42" (Approx.) M: 4.6cm x 4.3cm / 1.81" x 1.69" (Approx.) L: 5cm x 5.4cm / 1.97" x 2.13" (Approx.) Notes: Due to differences in lighting and screen settings, the item color may vary slightly from images. Please allow slight measurement variation due to manual measurement. Package Includes: 1 x Odor-proof Floor Drain Core