High quality material: The sink stopper is made of pure copper and stainless steel. It is not easy to rust after long-term water flow. The stainless steel rebound core is flexible and does not get stuck.The pool is clean and tidy. Upgrade design: The basket is designed to filter and prevent clogging. You can remove the built-in drain basket to prevent the water pipe from being blocked by hair, rings and sink debris. In the same time, the basket can be easily removed and cleaned to keep the house clean and hygienic at all times. Spring air tightness adjustment: The pop-up design subverts the traditional and inconvenient drainage (like the base cap with a chain) Just gently press the top cover to switch between the 2 cap-modes (fill with water) and filter (empty). Quick Installation: Just tear off the old flap and install the new style, universal design, plug and play. Applicable Size: The appropriate size of the flip cap is 1.3 inch to 1.49 inch. Features:1. Brass core material, sturdy and durable, stronger oxidation and corrosion ability, and the surface is coated to increase the double oxidation ability.2. Spring-loaded design improves flex rebound capability from the drain plug and springs back flexibly during use.3. The basket design can filter hair, tea and impurities in the tub to prevent clogging.4. It can be disassembled, and the basket and the core of rebound can be disassembled easily, which is convenient for disassembly and cleaning and prevent the growth of bacteria.Check your exhaust size External flange diameter: 2.44 inches (2 7/16 inches) Smaller gauge : 1.34 inches (1 3/8 inches) Note: Do not order if inside diameter of drain hole is less than 1.34 inches. Bounce height: 1.97 inches (2 inches) Closed height: 1.6 inches (1 5/8 inches) This sink stopper fits a 1.33-1.49 inch inner diameter drain hole. Please measure the inner diameter of the drain hole so that the sink stopper works well.