Features:sewer silicone core sewer smell removal sealing ring drain adjustable backflow preventer good helper for family life, eliminate odor, adjustable lengthPrevent backflow: Prevent drainage from flowing back into the room; prevent leakage and overflow.Non-blocking: The floor drain core is specially designed to blocks smell from going back to the house, while allowing water to flow as usual through the pipe at the same time. No clogging problem.Notice:1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow slight deviation due to manual measurement.Specification:Type: Floor drain coreFunction: blocking smellMaterial: silicone, plastic, stainless steelSize:Type A: 3.9*10.5cm (suitable for 2.7-3.3cm floor drain aperture)Type B: 4.5*10.5cm (suitable for 3.4-3.9cm floor drain aperture)Type C: 6.0*5.2cm (suitable for 4-4.6cm floor drain aperture)Type D: 10.5*5.2cm (suitable for 4-4.6cm floor drain aperture)Included:1 x Floor drain core1 x Stainless steel filter1 x Stainless steel cap