Universal size universal flush button is compatible with most dual flush toilets. Toilet button size: 59mm*53mm. Diameter 59mm is suitable for toilet cistern holes with diameter 48mm - 57mm. Please check the toilet lid hole size before ordering Easy Installation The replacement toilet flush button is very easy to install. You need to measure the diameter of the toilet mouth and choose the right size. Open the toilet lid, remove the old toilet button and place the new toilet flush button in the hole. The stem of the standard water tank part can be cut to the correct length as per measurement and need High quality toilet button flush replacement parts are made from materials High quality ABS, the surface of the toilet button adopts advanced plating technology, absolutely solid, waterproof, durable, not easy to fade, not easy to corrode, can be used for a long time in humid environments such as the bathroom The toilet tank flush button is designed with two buttons and is suitable for most toilets, such as multi-function toilets or squat toilets. The two buttons differ in size and water flow. You save water by simply pressing the toilet button when needed