Seal Stopper Anti odor Floor drain Drain cover Sewer plug Item Description: Applications: for 2.6~3.5cm holes/for 3.6~4.2cm holes/for 4.2~5cm holes Features:Anti-odor/anti-defect/quick drainage/insect prevention Size: S/M/L Material: ABS+Metal Applicable: Widely used for pipes tubes in toilet, bathroom, kitchen, floor and more. Easy to install, plug and play. Automatic opening when draining, closing after draining. Working principle: When the water enters the floor drain, the gravity of the water opens the bottom of the ABS seal and drips freely. After the water is stopped, the ASB seal is automatically closed due to gravity. Completely sealed, so that the gas in the pipeline, pests and excess cannot go up. Package included: 5pcs/set * Floor drain core Note: The filter cover can be removed when not needed. (Note: Send filter cover randomly) Some dimensional errors occur due to the need for manual measurements. Due to the difference between the different displays, the picture may not reflect the actual color of the item.