A small suction cup helps it adhere and prevents movement. This silicone drain plug features a suction cup that can be attached to the bathtub floor for a tight, waterproof seal. Silicone bathtub drain plugs fit most standard bathtubs and sinks, with a diameter of 13 cm/5.11 inches and a 100% sealing performance. Easy to use and convenient to store when not in use. Safety and environmental protection: The bathtub stopper is made of food-grade silicone gel, which is soft, non-toxic, environmentally friendly, and skin-friendly. It is easy to clean and can be disinfected in boiling water. This universal silicone drain plug fits all plug holes. The silicone drain hose is very smooth and soft to the touch. It is very flexible, and even small fingers can be safely removed without being injured. One size fits all, secure fit and good grip are very suitable for various applications (kitchen, bathroom, laundry room, utility room, jacuzzi). They have good power to prevent water loss. Product Description The flexible and soft silicone material has good sealing and drainage. This bathtub drain plug can be used widely in kitchens, bathrooms and laundry rooms. Waterproofing wash When the bathtub is not in use, prevent bad odors from the drain Reinforced design is close to the bathtub's drain pipe. Absorbs and fixes water, retains water Made of non-floating material. Universal helps to adapt to most different drain pipes. Diameter: 5.12" & Inner circle diameter: 2.16" Flat silicone plugs can be easily used in various areas Allows the bathtub plug to more easily conform to an uneven or contoured surface. Suction/pressure makes a good seal. This is very useful for old plumbing bathtubs where you can't find a suitable replacement plug. For this product, one size should fit all. Press down on the suture to seal with water pressure and prevent movement. Small water-absorbing design, easy to store and use, easy to hang on the wall when not in use.