【Prevents Backflow & Odor】 The check valve design ensures the bottom cover automatically opens with water flow during drainage and seals tightly when idle. Its one-way mechanism blocks reverse opening, effectively preventing sewage backflow. Equipped with 【triple-layer sealing rings】, it locks in odors and eliminates gaps for gas leakage, keeping your space fresh. " 【High-Flow Drainage, Clog-Free】 The valve plate adjusts its opening angle up to 【90°】based on water flow intensity—stronger flow, wider opening. Even with heavy drainage, it maintains smooth water passage and **prevents floor puddles** from slow drainage. " 【Tool-Free Installation】 Simply insert the drain plug into the drain opening and press gently to complete installation. When cleaning is needed, lift the handle to remove it effortlessly. 【Premium Brass, Corrosion & Rust-Resistant】 Each product weighs approximately 0.1 lbs and is made of high-quality brass, ensuring no corrosion or rust in sewage environments. 【Fits 1.28"-2.08" Drain Openings】 The connecting part has a diameter of 1.28 inches and an upper outer diameter of 1.65 inches. The included adapter ring extends compatibility to 2.08 inches, making it suitable for drain openings ranging from 1.28" to 2.08".