High adaptability and compatibility make it very reliable and practical. Simple and convenient installation will not waste your time and energy. Anti-reflux and odor-resistant feature makes it very useful and effective. Different sizes allow you to choose the most suitable one according to your needs. Made of plastic material, it is very durable to use. There are three sizes for you to choose from: S, M, L. When water enters the floor drain, the gravity of the water will open the bottom ABS gasket, dripping unimpeded. After the water is cut off, the ASB gasket is automatically closed due to gravity. It is completely sealed, so that the gas and overflow in the pipeline cannot go upwards. It can prevent odors in summer, and air-conditioning in winter. Item Name: Odor-proof Floor Drain Core Material: Plastic Features: Anti-reflow, Easy to Install, Completely Sealed Usage Instruction: S: Suitable for 26-35mm floor drain inner diameter, installation height more than 43mm M: Suitable for 36-42mm floor drain inner diameter, installation height more than 47mm L: Suitable for 36-53mm floor drain inner diameter or PVC pipe 50mm inner diameter, installation height more than 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 the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Odor-proof Floor Drain Core