UNIVERSAL SIZE: Compatible with most dual flush toilets. Diameter: 38mm/1.5 inch. The toilet flush button fits holes with a diameter of 38mm-43mm. Please check the size of your toilet lid hole before ordering. REFUSE TO GET STUCK: The toilet flush button uses a 304 stainless steel spring, tested for over 100,000 presses without weakening. The button is made of engineering ABS plastic, providing strength and durability. Resists leaks and prevents sticking. EASY TO INSTALL: The flush toilet button is simple to install. Just screw it in by hand—no additional tools required. Saves time and effort. BEAUTIFUL APPEARANCE: The toilet push button features a chrome-plated surface with a textured finish, offering resistance to corrosion and damage. 100% GUARANTEE: All products include a 12-month warranty. If you are not satisfied, a full refund is available with no questions asked.