【High Sealing】: the drain valve has a sturdy design the solid brass rebounding core has good resilience and can seal the drain extremely reliably, this drain plug is for exhaust drain holes with inner diameter 3.36 cm. (1.3in) up to 3.69cm (1.45in) suitable. Please measure the inner diameter of the drain hole for the drain plug to work normally.【Rust and Corrosion Protection】: The sink drain hose fittings are made of stainless steel and brass, which can effectively prevent rust and corrosion from domestic sewage and oil stains.【Pop-up valve】: The flushing cap can prevent the sewer from sticking and prevent the generation of a peculiar smell. It won't tip over if you press the button lightly, so you don't have to worry about clogging and emptying. Two black silicone seals can maintain stability and improve sealing.【Filtration of impurities】: Compared to flip-top drainpipes, pop-up drainpipes are easier to filter out contaminants in the water such as hair and debris. Prevent clogging of water pipes.Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be some difference of color, the actual object received shall prevail.