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Universal Size. This sink stopper has a 33mm filter inner diameter, suitable for drain holes with inner diameters of 34mm to 40mm, making it suitable for most households. Built-in Filter: The sink stopper features a filter, basket filter, and multi-pore filter designed to separate water from hair or small objects, enabling quick drainage and easy cleaning, and effectively preventing clogging. Thickened Brass Core: The spring core is made of thickened brass for greater durability. It is installed in a spring lock to prevent the striker from getting stuck and to improve pressure sensitivity. Easy Installation. This sink stopper is very easy to install; simply pull out the old sink stopper and insert this new one into the drain hole. The entire process requires no tools and is very convenient and quick. Two Modes: Easy-to-use pop-up drain stopper with pressure switch mode for both water storage and drainage, suitable for sinks and bathtubs, etc.