UNIVERSAL SIZE: Compatible with most dual flush toilets. Diameter: 38mm/1.5in. The Ancable toilet flush button is compatible with a diameter of 38mm. Please check the size of the toilet lid hole before ordering. Refuse to stick: The Ancable toilet flush button uses a 304 stainless steel spring that has been pressure tested 100,000 times without weakening. The button part is made of engineering ABS plastic, which is strong and durable. Won't leak, won't get stuck EASY TO INSTALL: The Ancable toilet button is very easy to install. Just twist it by hand. No need to use any other tools. Save your time and energy. Beautiful appearance: Ancable toilet button flushing surface is chrome-plated, very textured, can prevent corrosion damage 100% Guarantee: All Ancable products are backed by a 12-month warranty, if you are not satisfied with our product