Features: Our toilet flange Rings provide a reliable and waterproof seal for toilet installation and repair projects. Make of PC and rubber materials to ensures long terms performances and durability. Ensures excellent adhesion and creates a tight seal to prevent water leakage and gas escaping. The integrated Backflow Prevention valves effectively prevents water from flowing back, eliminates the gas caused by backflow. The toilet flange Rings comes in a size that applicable to 100-110mm/3.94-4.33inch pipe inner diameter, making it easy to install. Specifications: Component: rubber, PC Style: Flange with clear check valves/Flange with clear check valves sealing strips/High elasticity flange/High elasticity flange with sealing strips Size: as shown in the picture Applicable outlet diameter: 100-110mm/3.94-4.33inch Package Includes: 1pc Sealing Rings note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.