Main function-This bathtub drain plug can seal the drain and save water. Safety and environmental protection-The bathtub stopper is made of food-grade silicone material, which is soft and non-toxic, environmentally friendly and skin-friendly. It is easy to clean and can be disinfected in boiling water. Universal size-The maximum diameter of the water plug bathtub is 5.12 inches and the inner diameter is 2.16 inches. It is compatible with different types of bathtub drains, bathroom sinks, kitchen sinks or floor drains. Built-in suction cup-a small suction cup helps it to absorb and prevent movement, it can be absorbed on the wall when not in use, and does not take up space. Durable sanitary sink plug cover: anti-fouling, recyclable, easy to take care of, machine washable, to prevent water and toys from running down in the bathtub, and to prevent excessive clogging to a certain extent. Product Function: When showering or soaking utensils in foamy water, do not let water/toys leak/run down, Instead of drain holes along the bathtub or sink. No cracking, long service life, cold and high temperature resistance. Easy storage: When the stopper is not in use, the suction cup can conveniently store the stopper on the wall. Working principle: Use the water pressure/weight principle to easily suck down the drain pipe. How to use and create a strong vacuum seal Step 1: Fill the bathtub with the overflow drain pipe and let the water pass through overflow. Step 2: Close the lid and gently lift the bottom drain plug. This immediately produces a strong vacuum seal. Product size: the maximum diameter is 5.12in, the inner diameter is 2.16in, which helps to adapt to the most differentDrain pipe. Material: Food Grade Silicone Package includes: silicone bathtub drain plug x2