🚫 Keep the Flow in Check—Your Home Deserves It! Effectively blocks backflow and unpleasant smells. Crafted from durable organic silicon for a sustainable choice. Ideal for bathrooms, kitchens, and more—keep every space fresh! Includes 4 versatile sizes to suit any drain. Quick and easy setup—just drop it in! High Quality Material 4 Sizes Backflow Prevention The Semetall Drain Backflow Preventer is a versatile 4-pack solution designed to fit various drain sizes, made from high-quality organic silicon for durability. Its innovative V-shaped cup design ensures effective backflow prevention and odor control, making it perfect for use in bathrooms, kitchens, and other areas of your home.